The smallest number which when diminished by 7, is divisible 12, 16, 18, 21 and 28 is:
Required number = (L.C.M. of 12,16, 18, 21, 28) + 7 = 1008 + 7 = 1015
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The ratio of two numbers is 3 : 4 and their H.C.F. is 4. Their L.C.M. is |
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252 can be expressed as a product of primes as: |
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21, 9, 21, 11, 21, 13, 21, ....... |
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Two trains, one from Howrah to Patna and the other from Patna to Howrah, start simultaneously. After they meet, the trains reach their destinations after 9 hours and 16 hours respectively. The ratio of their speeds is |
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If a and b are positive integers and (a-b)/3.5 = 4/7, then |
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If 5 women or 8 girls can do a work in 84 days. In how many days can 10 women and 5 girls can do the same work ? |
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If 9 men working 6 hours a day can do a work in 88 days. Then 6 men working 8 hours a day can do it in how many days? |
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Walking at 3/4 of his usual speed ,a man is late by 2 1/2 hr. the usual time is |
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In a boat 25 persons were sitting. Their average weight increased one kilogram when One man goes and a new man comes in. The weight of the new man is 70kgs. Find the Weight of the man who is going ? |
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A man can row 4.5 km/hr in still water. It takes him twice as long to row upstream as to row downstream. What is the rate of the current ? |
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