Question 39

The following equation is incorrect. Which two signs should be interchanged to correct the equation?
10 + 14 x 20 - 7 ÷ 10 = 40

Solution

Expression : 10 + 14 x 20 - 7 ÷ 10 = 40

(A) : - and ÷

$$\equiv10+14\times20\div7-10=40$$

L.H.S. = $$10+(\frac{14}{7}\times20)-10$$

= $$10+40-10=40=$$ R.H.S.

=> Ans - (A)

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The following equation is incorrect. Which two signs should be interchanged to correct the equation?10 + 14 x 20 - 7 ÷ 10 = 40