exam Maths Puzzle Numerical Ability

5x^2= 100

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exam Other Question

please verify if my answer is correct

If the sales tax rate is 6% and the tax on a purchase is $60, what was the amount of the purchase?
$60 X .06=
$63.60 A is eleven times as old as B. in a certain number of years, A will be five times as old as B, and in five years after that she will be three times as old as B. how old are they now.