Question 39
If digit 2 is interchanged with digit 1, then what will be the value of the following equation?
$$9 + 6 \div 4 \times 21 - 5 = ?$$
Solution
If we interchange digit 2 with 1, then 21 becomes 12-
9 + 6 $$\div$$ 4 $$\times$$ 12 - 5
= 9 + 18 - 5
=22
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