Which two numbers should be interchanged to make the given equation correct?
18 × 3 - 2 ÷ 4 + 7 = 59
- AOption (a)
7 and 3
- BOption (b)
18 and 4
- COption (c)
3 and 2
- DOption (d)
2 and 4
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Correct answer
2 and 4
Why this answer is correct
Let's check each option one by one.
Given equation: 18 × 3 - 2 ÷ 4 + 7 = 59
Option 1) 7 and 3
After interchange the numbers we get;
⇒ 18 × 7 - 2 ÷ 4 + 3 = 59
⇒ 18 × 7 - 0.5 + 3 = 59
⇒ 126 - 0.5 + 3 = 59
⇒ 129 - 0.5 = 59
⇒ 128.5 ≠ 59
⇒ LHS ≠ RHS
Option 2) 18 and 4
After interchange the numbers we get;
⇒ 4 × 3 - 2 ÷ 18 + 7 = 59
⇒ 4 × 3 - 0.11 + 7 = 59
⇒ 12 - 0.11 + 7 = 59
⇒ 19 - 0.11 = 59
⇒ 18.89 ≠ 59
⇒ LHS ≠ RHS
Option 3) 3 and 2
After interchange the numbers we get;
⇒ 18 × 2 - 3 ÷ 4 + 7 = 59
⇒ 18 × 2 - 0.75 + 7 = 59
⇒ 36 - 0.75 + 7 = 59
⇒ 43 - 0.75 = 59
⇒ 42.25 ≠ 59
⇒ LHS ≠ RHS
Option 4) 2 and 4
After interchange the numbers we get;
⇒ 18 × 3 - 4 ÷ 2 + 7 = 59
⇒ 18 × 3 - 2 + 7 = 59
⇒ 54 - 2 + 7 = 59
⇒ 61 - 2 = 59
⇒ 59 = 59
⇒ LHS = RHS
Hence, the correct answer is "Option 4".
























