exam Maths Puzzle Numerical Ability

Multiply express product in simplest form

2 9
-- X ---
15 16

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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 1x/2 + 1y/3 = 1/3
1x/6 + 1y/3 = 29