exam Maths Puzzle Numerical Ability

A 60 mililiter soulution has 50% acid. How much pure water is needed to get 25% acid.

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exam Other Question

On a triangle one long side is 7.21 " the opposite is 6' find the value A and a. Hi can you help me with the following problem?
Write the answer in standard form of scientific notation correctly rounded to 2 figures.
(8.69 x 10^-9) ( 5.20 x 10^6)
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