Question : Directions: By interchanging the two signs which of the following equations will not be correct?
+ and ×
I.15 + 5 ÷ 1 – 9 × 4 = 70
II.18 × 17 + 3 – 6 ÷ 2 = 133
Option 1: Neither I nor II
Option 2: Only II
Option 3: Both I and II
Option 4: Only I
Correct Answer: Only II
Solution :
Given:
+ and × are interchanged.
I.15 + 5 ÷ 1 – 9 × 4 = 70
II.18 × 17 + 3 – 6 ÷ 2 = 133
After interchanging the symbols the equation becomes –
I.15 × 5 ÷ 1 – 9 + 4 = 70
= 75 – 5
= 70 = R.H.S.
II.18 + 17 × 3 – 6 ÷ 2 = 133
= 18 + 17 × 3 – 3
= 18 + 51 – 3
= 66 ≠ 133
So, the equation II is not correct. Hence, the second option is correct.
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