Which two numbers should be interchanged to make the given equation correct?
$$81 + 31 \div 9 - 7 = 33$$
$$81\ +\ 31\ \frac{\ 9}{ }\ -\ 7=33$$
9 and 7
$$81\ +\ 31\ \frac{\ 7}{ }\ -\ 9=33$$
$$112\ \frac{\ 7}{ }-9=33$$
$$16\ -\ 9=33$$
$$7=33$$
31 and 9
$$81\ +\ 9\ \frac{\ 31}{ }-7=33$$
$$90\ \frac{\ 31}{ }-7=33$$
$$90\ \frac{\ 24}{ }=33$$
$$3.75=33$$
31 and 81
$$31\ +\ 81\ \frac{\ 9}{ }-7=33$$
$$31\ +\ 9\ -\ 7=33$$
$$40-7=33$$
$$33=33$$
81 and 7
$$7\ +\ 31\ \frac{\ 9}{ }-81=33$$
$$38\ \frac{\ 9}{ }-81=33$$
$$4.22-81=33$$
$$-76.78=33$$
Hence Option C is the correct answer L.H.S=R.H.S
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