book Maths Puzzle Numerical Ability

A chemist mixes 10% citric acid solution with a 50% acid solution to form 40ml of a 40% solution. How much of each solution should be used in the mixture?

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book Other Question

2x^2 + x -10/-12 + 8x – x^2



2x^2 + 3x -9/ divide x^2 + 10x +24/
2x^2 – 13x + 15 x^2 + x – 30



8x/4-x - 5x/x-4



Divide

4i/6 + 5i


2y√[27
solve the following equations for x and y.

1.x+y=25
y=4x

2.x=y+8
2x+y=52

5. 3x+y=33
x=y-13

7.x-y=-10
3x=y+18