Question 64

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

$$15 \times 12 + 40 \div 40 - 6 = 21$$

Solution

Expression : $$15 \times 12 + 40 \div 40 - 6 = 21$$

(A) : + and x

$$\equiv15+ 12 \times 40 \div 40 - 6 = 21$$

L.H.S. = $$15+(12\times\frac{40}{40})-6$$

= $$15+12-6=21=$$ R.H.S.

=> Ans - (A)

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The following equation is incorrect. Which two signs should be interchanged to correct the equation?$$15 \times 12 + 40 \div 40 - 6 = 21$$