\(\frac{4}{5} \times 45\%\) of ? = 75 + 20% of 125

Correct answer: 4

Solution

The right-hand side is 75 + 20% of 125 = 75 + 25 = 100. The left-hand side becomes \(\frac{4}{5} \times \frac{45}{100} \times ? = \frac{9}{25}?\), so \(\frac{9}{25}? = 100\), giving ? = 4. Hence, the correct answer is 4.

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