Question 39

The following equation is incorrect. Which two signs should be interchanged to correct the equation?
$$9 \div 3 - 30 \times 7 + 6 = 15$$

Solution

Expression : $$9 \div 3 - 30 \times 7 + 6 = 15$$

(A) : + and ÷

L.H.S. = $$9+ 3 - 30 \times 7 \div 6$$

= $$12-(5\times7)=-23\neq$$ R.H.S.

(B) : x and +

L.H.S. = $$9 \div 3 - 30 + 7 \times 6$$

= $$\frac{9}{3}-30+42=15=$$ R.H.S.

=> Ans - (B)

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The following equation is incorrect. Which two signs should be interchanged to correct the equation?$$9 \div 3 - 30 \times 7 + 6 = 15$$