exam Maths Puzzle Numerical Ability

Juan is 8 years older that his sister. In 3 years, he will be twice as old as she will be then. How old is each now?

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exam Other Question

How much pure solvent must be added to 600 ounces of 16 2/3% solvent to increase its strength to 37.5%? Find the balance.

$18,500 at the 9% compounded semiannually for 5 years. HELP!