After interchanging + & x and 12 &18, which of the following equations will hold true?

Question 18

Solution

We need to interchange : + & x and 12 &18

(A) : (9 + 12) x 18 = 60

$$\equiv(9\times18)+12=60$$

L.H.S. $$=162+12=174\neq$$ R.H.S.

(B) : (18 + 6) x 12 = 90

$$\equiv(12\times6)+18=90$$

L.H.S. $$=72+18=90=$$ R.H.S.

=> Ans - (B)

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