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Question 18
Which two signs should be interchanged in the following equation to make it correct?
$$5 \times 15 \div 7 - 20 + 4 = 77$$
Solution
By trial and error method,
Option A
$$5\times15\div7+20-4=77$$
$$\frac{5\times15}{7}+20-4=77$$
$$\frac{75}{7}+20-4=77$$
75 is not divisible by 7 so we get a decimal number after solving which is not possible
Option B
$$5\times15+7-20\div4=77$$
$$5\times15+7-5=77$$
$$75+7-5=77$$
$$77=77$$
Hence, the correct answer is Option B
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