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BECE Mathematics 2021 Paper

Question : 31

Total: 40

5,6,7

x

x

Solution:

Sum of observations (numbers)

=5+6+7+x

Total number of observations (numbers) = how many numbers are in the observation. In this case 4, thus

(5,6,7

and

x

)

Every number is divisible by 1

Re-write the equation

Simplify like terms and cross multiply to solve for the value of

x

1 \times (18+x)=4 \times 8

1 times any number is the same number, hence

1 x (18+x)=18+x

\;4 \times 8=32

\;18+x=32

\;x=32-18

\;x=14

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