If ‘A’ stands for ‘÷’, ‘B’ stands for ‘×’, ‘C’ stands for ‘+’ and ‘D’ stands for ‘−’, what will come in place of the question mark ‘?’ in the following equation?
7 A 7 C 20 B 2 = ? C 20
- AOption (a)
22
- BOption (b)
24
- COption (c)
20
- DOption (d)
21
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Correct answer
21
Why this answer is correct
Preparing the family tree diagram by using the following symbols:
As per the given information:
Deciphering the signs:
| A | B | C | D |
|---|---|---|---|
| ÷ | × | + | − |
Given Equation: 7 A 7 C 20 B 2 = ? C 20
Applying the conditions and BODMAS rule:
= 7 ÷ 7 + 20 × 2 = ? + 20
= 1 + 20 × 2 = ? + 20
= 1 + 40 = ? + 20
= 41 = ? + 20
? = 41 − 20
? = 21
Hence, the correct answer is "option 4"