Which two numbers should be interchanged to make the following equation correct?
$$3 \times 9 + 5 - 18 \div 7 = 24$$
By Trial and Error method,
Option A
$$3\times18+5-9\div7=24$$
$$3\times18+5-\frac{9}{7}=24$$
The value will be decimal after solving which is not possible
Option B
$$5\times9+3-18\div7=24$$
$$5\times9+3-\frac{18}{7}=24$$
The value will be decimal after solving which is not possible
Option C
$$3\times7+5-18\div9=24$$
$$3\times7+5-2=24$$
$$21+5-2=24$$
$$24=24$$
Hence, the correct answer is Option C
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