Question : Directions: By Interchanging the given two numbers which of the following equations will be not correct?
9 and 7
I. 7 × 3 – 8 + 4 + 9 = 32
II. 7 – 9 × 2 + 6 ÷ 3 = –3
Option 1: Only II
Option 2: Neither I nor II
Option 3: Both I and II
Option 4: Only I
Correct Answer: Only II
Solution :
Given:
9 and 7 are interchanged.
I. 7 × 3 – 8 + 4 + 9 = 32
II. 7 – 9 × 2 + 6 ÷ 3 = –3
Let's solve each equation –
I. 9 × 3 – 8 + 4 + 7 = 32
= 27 – 3
= 24 ≠ 32
II. 9 – 7 × 2 + 6 ÷ 3 = –3
= 9 – 7 × 2 + 2
= 9 – 14 + 2
= –3 = R.H.S.
So, only the second equation is correct. Hence, the first option is correct.
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