exam Maths Puzzle Numerical Ability

What quantity of 70 per cent acid solution must be mixed with a 20 percent solution to produce 700 mL of a 50 per cent solution?

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hello, i need some help to simplify and reduce to lowest terms

1/(x+5y)-5/(x-5y)+3/(x^2-25y^2) You have taken 3 tests and have an average of 72 points. If you score 100 points on each of the rest of your tests, how many more tests do you need to take to raise your average to 88 points?