Question 3

Which two signs and two numbers should be interchanged in the following equation to make it correct?
$$8 + 15 - 20 \times 10 \div 5 = 47$$

Solution

$$8 + 15 - 20 \times 10 \div 5 = 47$$

After interchanging the, $$+ and -, 8 and 15$$

$$15 - 8 + 20 \times 10 \div 5 = 47$$

$$7+40 = 47$$

$$47=47$$

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