If P denotes ‘×’, Q denotes ‘÷’, R denotes ‘+’ and S denotes ‘−’, then what will come in place of ‘?’ in the following equation?
(40 Q 4 ) P 5 R (3 P 6) S (7 P 8) R 21 = ?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 33
Given equation is: (40 Q 4 ) P 5 R (3 P 6) S (7 P 8) R 21 = ?
P denotes ‘×’, Q denotes ‘÷’, R denotes ‘+’ and S denotes ‘−’.
Replacing the letters with signs:
(40 ÷ 4 ) × 5 + (3 × 6) − (7 × 8) + 21
= (10 ) × 5 + (18) − (56) + 21
= 50 + 18 − 56 + 21
= 89 − 56
= 33
Hence, option 1 is the correct option.