Quantitative Aptitude :: Profit and Loss - Discussion

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Explanation:
S.P. of 1 kg mixture = Rs.23. Gain = 15%.
CP of 1 kg mixture = Rs.[(100/115) * 23] = Rs.20
Lets assume the quantity of wheat costing Rs.24 = x kgs.
Using weighted average rule = (x*24+30*18.4)/ (x+30)=20
=> x = 12.