exam Maths Puzzle Numerical Ability

I need help on this problem:

A chemist needs 900 millileters of a 40% acid solution for a chemistry experiment. The chemist combines x milliliters of a 20% acid solution and y m

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exam Other Question

solving the following system of equations

x-2y=5
-3x+2y=7

Is x=3 and y=-1 correct?
Thanks
Multiply express product in simplest form

2 9
-- X ---
15 16