Question 24

Which two signs and numbers should be interchanged in the following equation to make it correct?
$$10 + 8 - 200 \times 15 \div 5 = 407$$

Solution

$$10 + 8 - 200 \times 15 \div 5 = 407$$

after interchanging $$+ and -, 15 and 10$$

$$15 - 8 + 200 \times 10 \div 5 = 407$$

$$7+400 = 407$$

$$407=407$$

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