What will come in the place of the question mark (?) in the following equation, if ‘+' and ‘−’ are interchanged and '× ' and ‘÷’ are interchanged?
216 × 9 + 52 − 7 ÷ 7 = ?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 21.
Given equation: 216 × 9 + 52 − 7 ÷ 7 = ?
On interchanging the signs:
(216 ÷ 9) - 52 + 7 × 7 = ?
= 24 - 52 + (7 × 7)
= 24 - 52 + 49
= 73 - 52
= 21