Question : Directions: Which two numbers should be interchanged to make the given equation correct?
63 ÷ 21 – 42 + 8 × 7 = 135
Option 1: 7 and 63
Option 2: 7 and 21
Option 3: 21 and 42
Option 4: 21 and 8
Correct Answer: 7 and 21
Solution :
Given:
63 ÷ 21 – 42 + 8 × 7 = 135
Replace the given numbers in the options one by one with the original numbers in the given equation.
First option:
7 and 63
= 7 ÷ 21 – 42 + 8 × 63
= 0.34 – 42 + 504
= 462.34 ≠ 135
Second option:
7 and 21
= 63 ÷ 7 – 42 + 8 × 21
= 9 – 42 + 168
= 135
Third option:
21 and 42
= 63 ÷ 42 – 21 + 8 × 7
= 1.5 – 21 + 56
= 36.5 ≠ 135
Fourth option:
21 and 8
= 63 ÷ 8 – 42 + 21 × 7
= 7.88 – 42 + 147
= 112.88 ≠ 135
Here, only the second option satisfies the R.H.S. of the given equation. Hence, the second option is correct.
Related Questions
Know More about
Staff Selection Commission Sub Inspector ...
Result | Eligibility | Application | Selection Process | Cutoff | Admit Card | Preparation Tips
Get Updates Brochure
Your Staff Selection Commission Sub Inspector Exam brochure has been successfully mailed to your registered email id “”.
