Question : Directions: Which two numbers should be interchanged to make the given equation correct?
7 – 5 + 4 × 2 = 25
Option 1: 4 and 2
Option 2: 7 and 5
Option 3: 25 and 7
Option 4: 5 and 2
Correct Answer: 5 and 2
Solution :
Given:
7 – 5 + 4 × 2 = 25
Replace the given numbers according to the options one by one with the original numbers in the given equation.
First option:
4 and 2
⇒ 7 – 5 + 2 × 4 = 25
= 7 – 5 + 8
= 2 + 8
= 10 ≠ 25
Second option:
7 and 5
⇒ 5 – 7 + 4 × 2 = 25
= 5 – 7 + 8
= – 2 + 8
= 6 ≠ 25
Third option:
25 and 7
⇒ 25 – 5 + 4 × 2 = 7
= 25 – 5 + 8 = 7
= 20 + 8
= 28 ≠ 7
Fourth option:
5 and 2
⇒ 7 – 2 + 4 × 5 = 25
= 7 – 2 + 20
= 5 + 20
= 25 = R.H.S.
So, only the fourth option satisfies the R.H.S. of the given equation. Hence, the fourth option is correct.
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