book Maths Puzzle Numerical Ability

A chemist needs 70 milliliters of a 41% solution but has only 21% and 56% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.

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book Other Question

If possible, simplify the ratinoal expression.

2x - 3 / 4x - 6
Diameter of a circle. If the diameter of a circle is 1.3 X 10^-12 meters, then what is its radius?