exam Maths Puzzle Numerical Ability

if 160 kilograms of an alloy contain 76.8 kilograms of copper, what percent of th alloy is copper?

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exam Other Question

A placement exam for entrance into a math class yields a mean of 80 and a standard deviation of 10. The distribution of the scores is roughly bell-shaped. Use the Empirical Rule to find the percentage of scores that lie between 60 and 80. The roots of the equation x^2-4x=b are 7 and a. Find the value of a.