Question : Directions: Which two numbers should be interchanged to make the given equation correct?
4 × 2 – 3 + 5 = 7
Option 1: 3 and 4
Option 2: 4 and 5
Option 3: 7 and 5
Option 4: 2 and 7
Correct Answer: 3 and 4
Solution :
Given:
4
×
2 – 3 + 5 = 7
Let's check the options –
First option:
3 and 4
3
×
2 – 4 + 5 = 7
6 – 4 + 5 = 7
7 = 7 (L.H.S. = R.H.S.)
Second option:
4 and 5
5
×
2 – 3 + 4 = 7
10 – 3 + 4 = 7
11
≠ 7
Third option:
7 and 5
4 × 2 – 3 + 7 = 5
8 – 3 + 7 = 5
12 ≠ 7
Fourth option:
2 and 7
4 × 7 – 3 + 5 = 2
28 – 3 + 5 = 2
30 ≠ 2
So, by interchanging 3 and 4 equation becomes equal. Hence, the first option is correct.
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