exam Maths Puzzle Numerical Ability

4x-7y=14 20x-35y=-15 subitution method

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Tom tried to compute the average of his 7 test scores. He mistakenly divided them by 6, which yeilds 84. What is the correct average test score? The compound amount with continuous compounding is given by A = P e^rt , where P is the principal, r the rate, and t the time in years. If the rate is 10%, find how long it takes for the money to double, that is for A = 2P. (ln 2 = 0.69315)