Question

What will come in the place of the question mark (?) in the following equation, if '÷' and 'x' are interchanged and '-' and '+' are interchanged? 18 ÷ 90 - 5 × 11 + 2 =?

• A. 18
• B. 15
• C. 22
• D. 27

Answer 1

Answer:

C. 22

We are told to interchange:

• + and ×

• − and ÷

  Apply the interchanges

Original expression:

18 ÷ 90 − 5 × 11 + 2

Now replace symbols:

÷ ↔ −

• ↔ ×

So:

18 ÷ 90 → 18 − 90
− 5 → ÷ 5
× 11 → + 11

• 2 → × 2

New expression becomes:

18 − 90 ÷ 5 + 11 × 2

Apply BODMAS

Expression:

18 − 90 ÷ 5 + 11 × 2

First division and multiplication:

90 ÷ 5 = 18
11 × 2 = 22

Now substitute:

18 − 18 + 22

Solve left to right

18 − 18 = 0
0 + 22 = 22

Final Answer:

22