book Maths Puzzle Numerical Ability

Ralph spends 15 1/3 hours per month playing tennis. How many hours does he play tennis in a year? (There are Twelve months in a year.)

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book Other Question
How do you find the percent of change in these math problems.

1.180 to 150

2. 15,000 to 12,000

3. 6 to 6.50 Simplify the following equation: a/4ab