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20137.In a classroom the average height of all the boys was 170 cm. Rahim recently joined the class which originally had 20 boys increased the average to 171cm. Then find the height of Rahim.
185 cms
191 cms
190 cms
none
Explanation:

Before Rahim joined the total height of all the boys = 170 X 20 = 3400.

New average = (Total height of all students + height of Rahim)/21 = 180

Therefore (3400 + height of Rahim)/21 = 171

Therefore height of Rahim = 3780 - 3400 = 191 cms.

20138.The average age of a group of 12 students is 20years. If 4 more students join the group, the average age increases by 1 year. The average age of the new students is
24
26
23
22
Explanation:

Total age of 12 students=12 $\times$ 20=240

Total age of 4 students =4x (assuming the average age of 4 students)

Hence the equation=240+4x=16 $\times$ 21=336

solving the equation we get x=24

So, average age of the new students =24.

20139.The price of a jewel, after passing through three merchants rises on the whole by 80%. If the first and the second merchants earned 20% and 25% profit respectively, find the percentage profit earned by the third merchant.
50%
80%
20%
100%
Explanation:

Let initial price is 100 then final will be 180

100---+20%------120

120 ----- +25%----150

150-----+20%-----180.

20140.A constructor estimates that 3 people can paint Mr. khans house in 4 days. If he uses 4 people instead of 3, how long will they take to complete the job?
4
2
3
5
Explanation:

Given, 3 people requires 4 days.

As the people are increased to 4, i.e. 3 $\times$ (4/3) =4, so work will be reduced to (3/4) $\times$ 4=3 days.

20141.How many 4-letter words with or without meaning, can be formed out of the letters of the word, LOGARITHMS, if repetition of letters is not allowed?
40
400
50400
2520
Explanation:

The Word LOGARITHMS is containing 10 letters.

To find how many 4 letter word we can find from that = 10 $\times$ 9 $\times$ 8 $\times$ 7.

20142.If 6th March, 2005 is Monday, what was the day of the week on 6th March, 2004?
Sunday
Saturday
Tuesday
Wednesday
Explanation:

The year 2004 is a leap year. So, it has 2 odd days.

But, Feb 2004 not included because we are calculating from March 2004 to March 2005. So it has 1 odd day only.

The day on 6th March, 2005 will be 1 day beyond the day on 6th March, 2004.

Given that, 6th March, 2005 is Monday.

6th March, 2004 is Sunday (1 day before to 6th March, 2005).

20143.At 6o clock, a clock ticks 6 times. The time between first and last ticks is 30 seconds. How long does it tick at 12o clock?
66 secs
55 secs
60 secs
62 secs
Explanation:

For ticking 6 times, there are 5 intervals.

Each interval has time duration of 30/5=6 secs.

At 12 oclock, there are 11 intervals.

So total time for 11 intervals = 11 $\times$ 6=66 secs.

20144.Two urns contain respectively 2 red 3 white and 3 red,5 white balls. One ball is drawn at random from the first urn and transferred into the second. A ball is now drawn from the second urn and it turns out to be red. What is the probability that the transferred ball was white?
1/17
9/17
8/17
none
Explanation:

According to the Bayes theorem,

p (no of way to drawn a ball from 2nd urns is red and ball transferred from 1 urns) =(3c1/5c1) $\times$ (3c1/9c1) =9/45.

Total=(2c1/5c1) $\times$ (4c1/9c1) +(3c1/5c1) $\times$ (3c1/9c1) =17/45.

So, probability = (9/45)/ (17/45) = 9/17.

20145.Two trains A and B start simultaneously from stations X and Y towards each other respectively. After meeting at apoint between X and Y, train A reaches station Y in 9 hours and train B reaches station X in 4 hours from thetime they have met each other. If the speed of train A is 36 km/hr., what is the speed of train B?
24 km/hr.
54 km/hr.
81 km/hr.
16 km/hr.
Explanation:

The total distance between X & Y is 9 $\times$ 36 km.

Therefore, the speed of B = (9 $\times$ 36)/4 = 81 kmph.

20146.An alloy of zinc and copper contains the metals in the ratio 5: 3. The quantity of zinc to be added to 6 kg of the alloy so that the ratio of the metal may be 3: 1 is:
5 kg
2 kg
3 kg
4 kg
Explanation:

In 6kg of alloy 15/4-zinc and 9/4-copper.

So, let extra zinc added be x.

=> (15/4+x)/ (9/4) =3/1.

=> x=3.

20147.

Flipkart Logical Reasoning Test

Syllogism:

Statements:

All horses are donkeys.

All donkeys are monkeys.

Conclusion:

(I)All horses are monkeys.

(II)All monkeys are horses

Only inference I is followed.
Only inference II is followed.
Both inference I & II are followed.
Neither inference I nor II followed.
20148.Analogy:215:474::537:?
26
27
25
22
Explanation:

Since, 2+1+5+ 4+7+4 =23

Therefore, 5+3+7+x = 23.

=> x = 8.

Combination that match 8 is 26 since 2+6=8.

20149.If in a coded language, 2+6+7=24, 8+2+8=73, 3+4+4=40.Then 7+3+9=??
90
106
100
none
Explanation:

As we have

(2+6+7) +9=24

(3+4+4) +29=40

(8+2+8) +55=73

(7+3+9) +87=106

Now Consider no.9 then 29 then 55 then 87

Its series of difference 29 and 9 as 5×4+0=20

Then 55 and 29 as 5×5+1=26.

Then 87 and 55 as 5×6+2=32.

20150.Pointing towards a photo on wall Raju said "His father`s only granddaughter is my wife" how Raju is related to that man in photo.
nephew
son
son-in-law
none of these
Explanation:

Man in photo--->his father---->only granddaughter will be daughter of man in photo.

Now that daughter is wife of Raju.

Hence Raju is "Son in law" of man in photo.

20151.A man is facing North West. He turns 90 degrees in the clockwise direction and then 135degrees in the anti-clockwise direction. Which direction is he facing now?
East
West
North
South
Explanation:

Turns 90 degrees from northwest in clockwise direction is; His position is Northeast from Northeast, turns 135 degrees in anti-clock: his position is west.

20152.Statement: You know that your suit is excellent when people ask about your tailor who tailored the suit.

Assumptions:

(I)People do not ask about your tailor if your suit is not good.

(II) The people want to know the criterion of an excellent suit.

Only assumption I is implicit
Only assumption II is implicit
Either I or II is implicit
Neither I nor II is implicit
Explanation:

The statement mentions that if the people ask about the tailor, your suit is good. This means that people ask only in the situation when the thing is good. So, I is implicit. The criteria of an excellent suit is not mentioned. So, II is not implicit.

20153.1, 10, 27, 64, 66, What is the next number in the sequence?
145
120
80
99
Explanation:

1+13 $\times$ 2=27

27+13 $\times$ 3=66

Similarly,

10+27 $\times$ 2=64

64+27 $\times$ 3=145

Hence 145 is the answer.

20154.Statement: Should all the unauthorized structures in the city be demolished?

Arguments:

(I)No. Where will the people residing in such houses live?

(II)Yes. This will give a clear message to general public and they will refrain from constructing unauthorized buildings.

Only argument I is strong
Only argument II is strong
Either I or II is strong
Neither I nor II is strong
Explanation:

The demolition of unauthorized buildings would teach a lesson to the unscrupulous builders and also serve as a warning for the citizens not to indulge in such activities in the future. This is essential, as unauthorized constructions impose undue burden on the citys infrastructure. So, only argument II holds strong.

20155.Find the missing pattern: -

P5QR, P4QS, P3QT, _____, P1QV

PQW
PQV2
P2QU
PQ3U
Explanation:

The first two letters, PQ, are static. The third letter is in alphabetical order, beginning with R. The number series is in descending order beginning with 5.

20156.If in a certain language, COUNSEL is coded as BITIRAK, how is GUIDANCE written in that code ?
EOHYZJBB
FOIYZJBB
FOHYZJBB
None of above
Explanation:

The letters at odd positions are each moved one step backward, while the letters at even positions are respectively moved six, five, four, three, two... steps backward to obtain the corresponding letters of the code.

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