book Maths Puzzle Numerical Ability

Joan Madden decided to pay 1/5 of the camp tuition for her grandson. Joan saved her daughter-in-law $250. What was the total cost of the tuition?

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Each person must finish a 110-item test in 90 minutes. How much time(in seconds) should be spent in each test item to be able to complete the test in the time allotted? Simplify 4 * 3rd sqrt54 + 5 * 3rd sqrt16 + 7 * 3rd Sqrt81