How many kgs of Basmati rice costing Rs.42/kg should a shopkeeper mix with 25 kgs of ordinary rice costing Rs.24 per kg so that he makes a profit of 25% on selling the mixture at Rs.40/kg?
Choose one
A) 20.0 kgs  B) 12.5  C) 16.0 kgs  D) 200.0 kgs  E) None of these
Explanation :   Given, there is 25% profit by selling the mixture at Rs.40/kg, his cost per kg of the mixture = Rs.32/kg.   C.P of 1 kg of rice of 1st kind = Rs. 42.   C.P of 1 kg of rice of 2nd kind = Rs. 24.   Mean price = Rs. 40   By the rule of alligation, we have:   C.P. of 1kg of C.P. of 1kg of   rice of 1st rice of 2nd   kind (Rs. 42/kg) kind (Rs. 24/kg)   \ /   Mean Price   (Rs. 32/kg)   / \   40 - 24 : 42 - 32   (8) (10)   Let the amount of Basmati rice being mixed be x kgs.   =&gt;8/10=x/25.   =&gt;x=20.   Hence, amount is 20.0 kgs.   20.0 kgsnswer : 20.0 kgs
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How many kgs of Basmati rice costing Rs.42/kg should a shopkeeper mix with 25 kgs of ordinary rice costing Rs.24 per kg so that he makes a profit of 25% on selling the mixture at Rs.40/kg?