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BECE Mathematics 2021 Paper

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Question : 21

Total: 40

Priscila's age

i k

years while Mary's age is

b

years. If Mary is 15 years older than Priscila, Which of the following statements is correct?

$2k+b=15$
$b-k=15$
$k-b=15$
$2b+k=15$

Solution:

Concept:

Translate the age comparison into an equation relating Mary's age and Priscila's age.

Explanation:

Let Priscila's age be

k

years.

Let Mary's age be

b

years.

Mary is 15 years older than Priscila.

So, Mary's age equals Priscila's age plus 15.

This gives:

b = k + 15

Subtract

k

from both sides to make the equation match the options:

b - k = 15

This matches option B.

Answer:

B.

b-k=15

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