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BECE Mathematics 2019 Paper

Question : 35

Total: 40

Solution:

Concept:

A percentage is a fraction with denominator 100.

So, compare quantities only after converting them to the same unit.

Explanation:

Convert 3 hours 20 minutes into minutes.

1 hour

= 60

minutes.

So, 3 hours

= 3 \times 60 = 180

minutes.

Thus, 3 hours 20 minutes

= 180 + 20 = 200

minutes.

Now, required percentage

= \frac{30}{200} \times 100

\frac{30}{200} \times 100 = 15

Therefore, 30 minutes is 15% of 3 hours 20 minutes.

Answer:

15\%

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