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How many kgs of wheat costing Rs.24/- per kg must be mixed with 30 kgs of wheat costing Rs.18.40/- per kg so that 15% profit can be obtained by selling the mixture at Rs.23/- per kg?

20
15
10
12
Explanation:

S.P. of 1 kg mixture = Rs.23. Gain = 15%.

CP of 1 kg mixture = Rs. [(100/115) x 23] = Rs.20

Let the quantity of wheat costing Rs.24 is x kgs.

Using weighted average rule = ($x$×24+30×18.4)/ (x+30) =20

On Solving, we get x = 12.

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