exam Maths Puzzle Numerical Ability

An amount of money is invested at 4% annual simple interest, and twice that amount is invested at 5%. The total annual interest is $112. How much is invested at each rate?

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exam Other Question

if x varies directly as y, and x=42 when y = 6, find x when y = 7 Using the formula pH = -log[H+], show me how to find the hydrogen ion content of coffee when the pH level is 5.0
Write answer in scientific notation including units.