Question 29

Which two numbers should be interchanged to make the following equation correct?
$$3 \times 9 + 5 - 18 \div 7 = 24$$

Solution

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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Which two numbers should be interchanged to make the following equation correct?$$3 \times 9 + 5 - 18 \div 7 = 24$$