exam Maths Puzzle Numerical Ability

An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid?
So far I have done this just subtracted.
800-128=672

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exam Other Question

how do you do... substitution on this problem 4p+2q=8
q=2p+1 How many numbers between 100 and 200 (Inclusive) have an even number of factors?

Is there a formula for figuring this out or some sort of pattern? Thankyou