Indian Institute of Foreign Trade 2017 Solved Paper

Choice (A) Suppose the quantities of chemicals X and Y are 100x and 100y gms respectively, then quantities of salt A and salt B in these chemicals will be 5x + 10y and 10x + 6y.
Given that 5x + 10y ≥ 7 and 10x + 6y ≥ 7. Solving these in-equations we get, x≥

2

5

and y≥

1

2

Taking minimum values of x and y, quantities ofchemical X and Y can be calculated as 40g and 50 grespectively and total cost is 40×10.5+50×7.8=810.