exam Maths Puzzle Numerical Ability

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4 + c/4y^2

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exam Other Question

for the input-output matrix A, find the output required to meet the demand D:

A=0.2 0.4
0.3 0.6

D=700
400 A 40% antifreeze solution and a 70% antifreeze solution is mixed to make 12 gallons of 50% antifrezze solution. How many gallons of each antifreeze solution should be used.