exam Maths Puzzle Numerical Ability

(6 X 10^12)(3.2 X 10^8) / (1.6 X 10^7)(3 X 10^2)

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exam Other Question

Is -4 a solution to the equation 7x - 5 + 3x = 6 + x - 10 What is the total of hours I worked?
1 1/2 Tues., 3 3/4 hours Wed., and 2 1/4 hours Fri.?