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Question 1
Which two numbers should be interchanged to make the given equation correct?
$$9 + 7 \times 5 - 18 \div 2 = 3 \times 4 - 10 + 45 \div 5$$
Solution
$$9 + 7 \times 5 - 18 \div 2 = 3 \times 4 - 10 + 45 \div 5$$
By the option B,
To interchange the 7 and 4,
$$9 + 4 \times 5 - 18 \div 2 = 3 \times 7 - 10 + 45 \div 5$$
$$9 + 4 \times 5 - 9 = 3 \times 7 - 10 + 9$$
$$9 + 20 - 9 = 21 - 10 + 9$$
20 = 20
$$\therefore$$ The correct answer is option B.
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