Test Index

BECE Mathematics 2010 Paper

Question : 32

Total: 40

Solution:

Concept:

A percentage compares a given quantity with a base quantity, after converting both into the same unit.

Explanation:

First, convert the given time into minutes.

30

seconds

= \frac{1}{2}

minute.

So,

7

min

30

sec

= 7 + \frac{1}{2} = \frac{15}{2}

minutes.

Now,

1

hour

= 60

minutes.

Required percentage

= \frac{\frac{15}{2}}{60} \times 100\%

This gives

\frac{15}{2} \times \frac{1}{60} \times 100\%

Simplify:

\frac{15}{120} \times 100\% = \frac{1}{8} \times 100\%

Therefore, required percentage

= 12.5\%

Answer:

12.5\%

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