Question 39
The following equation is incorrect. Which two signs should be interchanged to correct the equation?
24 + 4 - 20 ÷ 9 x 5 = 31
Solution
Expression : 24 + 4 - 20 ÷ 9 x 5 = 31
(A) : - and +
L.H.S. = $$24-4+20\div9\times5$$
= $$20+\frac{100}{9}=31.11\neq$$ R.H.S.
(B) : ÷ and +
L.H.S. = $$24\div4-20+9\times5$$
= $$6-20+45=31=$$ R.H.S.
=> Ans - (B)
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