book Maths Puzzle Numerical Ability

5 years ago, a man was 7 times as old as his son. 5years hence, father will be 3 times as old as his son. Find their present ages.

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Simplify: y to the 4th power times y to the -2nd power. What are the steps you take to solve? jumping rope can burn 600 calories per hour; write and solve an inequality to find the number of hours of jumping rope that it would take for you to burn at least 450 calories.