Question : Directions: By Interchanging the given two numbers (not digits) which of the following equations will not be correct?
7 and 4
I. 4 × 3 – 7 + 8 ÷ 2 = 23
II. 7 × 5 – 9 ÷ 3 + 4 = 24
Option 1: Neither I nor II
Option 2: Only II
Option 3: Only I
Option 4: Both I and II
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Correct Answer: Only I
Solution :
Given:
I. 4 × 3 – 7 + 8 ÷ 2 = 23
II. 7 × 5 – 9 ÷ 3 + 4 = 24
After interchanging the numbers 7 and 4 the equations become –
I. 7 × 3 – 4 + 8 ÷ 2 = 23
= 21 – 4 + 4
= 21 ≠ 23
II. 4 × 5 – 9 ÷ 3 + 7 = 24
= 20 – 3 + 7
= 24
So, in equation I, L.H.S. ≠ R.H.S. Hence, the third option is correct.
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