Question 39

If the following interchanges are made in signs and numbers, which equation would be correct?
Interchanges:
Signs: $$\div$$ and $$—$$
Numbers: 15 and 5

Solution

Given,

Signs $$\div$$ and $$—$$ are interchanged

Numbers 15 and 5 are interchanged

By Trial and Error method,

Option A

$$4\times30\div5-15+12=21$$

$$4\times6-15+12=21$$

$$24-15+12=21$$

$$21=21$$

Hence, the correct answer is Option A

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If the following interchanges are made in signs and numbers, which equation would be correct?Interchanges:Signs: $$\div$$ and $$—$$Numbers: 15 and 5