exam Maths Puzzle Numerical Ability

I am stumped, and my parents are not much help with this one. I know it should be simple. Here is the question.

Place grouping symbols to make the equation below true.

100-99*3+7*2+1/24=1

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exam Other Question
A cellular phone company offers a contract for which the cost C, in dollars, of t minutes of telephoning is given by C= 0.25 (t-600) + 77.95, where it is assumed that t is greater 16. As Gary is preparing to move, he notices that several of his smaller packed boxes will fit inside a large one. If each of the smaller boxes is a cube with side length 9 inches,