If ‘P’ stands for ‘÷’, ‘Q’ stands for ‘×’, ‘R’ stands for ‘+’ and ‘S’ stands for ‘−’, what will come in place of the question mark (?) in the following equation?
[(18 S 5) Q 4] P 2 R 22 Q 3 S 24 R 9 = ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 77
[(18 S 5) Q 4] P 2 R 22 Q 3 S 24 R 9 = ?
After interchangeing signs,
= [( 18 - 5) × 4] ÷ 2 + 22 × 3 - 24 + 9
= [52 ÷ 2] + 66 - 15
= 26 + 66 - 15
= 92 - 15
= 77.