Discussion
What approximate value should come in place of the question mark (?) in the following equation?
129.78 + 37.39 × 50.89 ÷ 17.17 − 23.69 = ?
Answer: B
The approximate value is 217. Following BODMAS, multiplication and division come before addition and subtraction: 37.39 × 50.89 ≈ 1903, and 1903 ÷ 17.17 ≈ 110.8. Then 129.78 + 110.8 = 240.6, and 240.6 − 23.69 ≈ 216.9, which is nearest to 217.
\[ \frac{37.39 \times 50.89}{17.17} \approx 110.8 \]
\[ 129.78 + 110.8 - 23.69 \approx 217 \]
The options 289, 127 and 345 are far from this value, so the second option is the answer.
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