Question : Directions: By interchanging the given two signs ÷ and –, which of the following equations will be correct?
I. 143 + 6 × 18 ÷ 45 – 3 = 236
II. 133 – 7 + 16 × 11 ÷ 37 = 158
Option 1: Both I and II
Option 2: Only I
Option 3: Only II
Option 4: Neither I nor II
Correct Answer: Both I and II
Solution :
Given:
I. 143 + 6 × 18 ÷ 45 – 3 = 236
II. 133 – 7 + 16 × 11 ÷ 37 = 158
Equation I.
143 + 6 × 18 ÷ 45 – 3 = 236
On interchanging the mathematical signs, we get –
= 143 + 6 × 18 – 45 ÷ 3
= 143 + 6 × 18 – 15
= 143 + 108 – 15
= 236
Equation II.
133 – 7 + 16 × 11 ÷ 37 = 158
On interchanging the mathematical signs, we get –
= 133 ÷ 7 + 16 × 11 – 37
= 19 + 16 × 11 – 37
= 19 + 176 – 37
= 158
So, both I and II are correct. Hence, the first option is correct.
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