exam Maths Puzzle Numerical Ability

How much acid must be added to 40ml of a 20% solution to increase it to a 28% solution?

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exam Other Question

please show me how to Express as a logarithm of a single number or expression.
log(little 10) (little 3) sqrt M^2 Please help me to solve with the calculator to four places

16.) log x - 2.0832

17.) ln x = -1.1577