If 'A’ stands for ‘÷’, ‘B’ stands for '×', 'C’ stands for ‘+’, and ‘D’ stands for ‘-’, then the resultant of which of the following would be 80?  

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RRB Technician Grade III Official Paper (Held On: 30 Dec, 2024 Shift 2)
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  1. 18 C 5 A 42 D 6 B 17
  2. 18 A 5 B 42 C 6 D 17
  3. 18 B 5 C 42 A 6 D 17
  4. 18 D 5 A 42 B 6 C 17

Answer (Detailed Solution Below)

Option 3 : 18 B 5 C 42 A 6 D 17
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Detailed Solution

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Decoding the given information :

Sign A B C D
Means ÷ × + -

 

Now check each option:

Option 1) 18 C 5 A 42 D 6 B 17

18 + 5 ÷ 42 - 6 × 17

→ 18 + 5 ÷ 42 - 6 × 17

→ 18 + 0.199 - 6 × 17

→ 18 + 0.199 - 102

→ -83.881 ≠ 80

Option 2) 18 A 5 B 42 C 6 D 17

18 ÷ 5 × 42 + 6 - 17

→ 18 ÷ 5 × 42 + 6 - 17

→ 3.6 × 42 + 6 - 17

→ 151.2 + 6 - 17

→ 140.2 ≠ 80

Option 3) 18 B 5 C 42 A 6 D 17

18 × 5 + 42 ÷ 6 - 17 

→18 × 5 + 42 ÷ 6 - 17 

18 × 5 + 7 - 17 

→ 90 + 7 -17

→ 80 

Option 4) 18 D 5 A 42 B 6 C 17

18 - 5 ÷ 42 × 6 + 17

→ 18 - 5 ÷ 42 × 6 + 17

→ 18 - 0.119 × 6 + 17

→ 18 - 0.714 + 17

→ 34.286 ≠ 80.

Hence, the correct answer is "Option 3".

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