exam Maths Puzzle Numerical Ability

Five years ago a man was seven times as old as his son. Five years hence, the father will be three times as old as his son. Find their present ages.

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exam Other Question

Can someone show me the answer to this question from a previous exam i have recently take please. thankyou.

Emperical Rule

Approximately what percentage of people have temperatures between 96.34 and 98.2 degrees? -2x+2-2x less than 4-6x+2