What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘–’ are interchanged and also ‘×’ and ‘÷’ are interchanged?
143 – 42 × 7 ÷ 8 + 21 = ?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 170.
Given equation: 143 – 42 × 7 ÷ 8 + 21 = ?
On interchanging the signs:
143 + 42 ÷ 7 × 8 - 21 = ?
? = 143 + 48 - 21
? = 191 - 21 = 170