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Answer :
Answer:
6
Step-by-step explanation:
You want the number of kilos of rice at ₹65 per kg that are mixed with rice at ₹72 per kg such that sale of 21 kg of the mixture at ₹84 results in a 20% profit.
Setup
Let x represent the number of kg of ₹65 rice. Then (21-x) is the number of kg of ₹72 rice. The purchase price is multiplied by 1.20 to find the selling price. The total revenue from sales is ...
(65x +72(21-x))×1.20 = 84×21
Solution
Simplifying the equation gives ...
1.20×72×21 -1.20×7x = 84×21 . . . . . . . eliminate parentheses
1814.40 -8.4x = 1764 . . . . . . . . . . . simplify the products
50.4 = 8.4x . . . . . . . . . . . . . . . . subtract 1764-8.4x
6 = x . . . . . . . . . . . . . . . . . . divide by 8.4
6 kilos of ₹65/kg rice were bought for the mix.
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