Discussion
What approximate value should come in place of the question mark (?) in the following equation?
5.01 × 19.99 + 99.99 ÷ 25.01 – 34.11 – ? = 0
Answer: D
Round each number to the nearest convenient value. 5.01 x 19.99 is about 5 x 20 = 100. 99.99 / 25.01 is about 100 / 25 = 4. 34.11 is about 34. So the equation becomes 100 + 4 - 34 - ? = 0, which gives ? = 70. The answer is 70, option (D). The options 60, 80 and 50 would come from a mistake in the first product or in the sign of the last term, and the exact value, 70.0, is close to 70.
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