exam Maths Puzzle Numerical Ability

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

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exam Other Question

How many ounces of pure water must be added to 75 oz of a 20% salt solution to make a salt solution which is 15 % salt? 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