WAEC Mathematics 2020 Paper

Question : 12

Total: 48

Solve

\;\frac{1}{3}

\;\frac{2}{5}

(3 - 7x)

Solution:

Concept:

Solving a linear inequality by multiplying both sides by the least common multiple (LCM) to clear fractions.

Explanation:

Multiply both sides by

15

(the LCM of

3

and

5

) to remove the fractions:

5(5 - 3x) < 6(3 - 7x)

Expand both sides:

25 - 15x < 18 - 42x

Collect

x

terms on the left and constants on the right:

-15x + 42x < 18 - 25

27x < -7

Divide both sides by

27

x < \frac{-7}{27}

Answer:

x < \frac{-7}{27}

, i.e. option D.

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