What will come in the place of question mark (?) in the following equation, if '+' and '-' are interchanged and '×' and '÷' are interchanged?
10 - 12 ÷ 7 + 84 × 21 = ?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 90.
Given: 10 - 12 ÷ 7 + 84 × 21 = ?
On changing the signs:
⇒ ? = 10 + 12 × 7 - (84 ÷ 21)
⇒ ? = 10 + (12 × 7) - 4
⇒ ? = (10 + 84) - 4
⇒ ? = 94 - 4
⇒ ? = 90