book Maths Puzzle Numerical Ability

how do you change 3 5/8 into a improper fraction? Stuck on homework thanks

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if n=4.97,solve for 31.6-n I can't figure out how to solve this problem. Is it a ratio or a duality problem? Thank you for your help!

A solution starts off as 3 parts acid and 9 parts water. Later, 600