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What will come in the place of question mark '(?)' in the following equation, if '-' and '÷' are interchanged and 'x' and '+' are interchanged ? 8 + 63 - 7 x 7 ÷ 9 = ?

A68

B69

C70

D71

Answer:

C. 70

Read Explanation:

First, interchange the operators as instructed:

  • ‘+’ ↔ ‘x’

  • ‘−’ ↔ ‘÷’

8 + 63 − 7 × 7 ÷ 9

So the new expression is:
8×63÷7+798 × 63 ÷ 7 + 7 − 9
Now solve using BODMAS:

  1. (8 × 63 = 504)

  2. (504 ÷ 7 = 72)

  3. (72 + 7 = 79)

  4. (79 − 9 = 70)


=70=\boxed{70}



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