Question : Directions: Which two numbers should be interchanged, to make the given equation correct?
4 × 8 – 12 + 5 = 16
Option 1: 4 and 5
Option 2: 8 and 5
Option 3: 16 and 8
Option 4: 12 and 16
Correct Answer: 8 and 5
Solution :
Given:
4 × 8 – 12 + 5 = 16
Replace the given numbers in the options one by one with the original numbers in the given equation.
First option:
4 and 5
4 × 8 – 12 + 5 = 16
= 5 × 8 – 12 + 4 = 16
= 40 – 12 + 4
= 32
≠
16
Second option:
8 and 5
4 × 8 – 12 + 5 = 16
= 4 × 5 – 12 + 8 = 16
= 20 – 12 + 8
= 16
Third option:
16 and 8
4 × 8 – 12 + 5 = 16
= 4 × 16 – 12 + 5 = 8
= 64 – 12 + 5
= 57
≠
8
Fourth option:
12 and 16
4 × 8 – 12 + 5 = 16
= 4 × 8 – 16 + 5 = 12
= 32 – 16 + 5
= 21
≠
12
So, only the second option satisfies the condition. Hence, the second option is correct.
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