Question : Directions: If 14 @ 8 = 91 and 18 @ 4 = 51, then 21 @ 9 = ?
Option 1: 160
Option 2: 155
Option 3: 151
Option 4: 168
Correct Answer: 168
Solution : Given: 14 @ 8 = 91; 18 @ 4 = 51
From the solved equations – 14 @ 8 = 91→(14 × 8) – 21 = 112 – 21 = 91 18 @ 4 = 51→(18 × 4) – 21 = 72 – 21 = 51 Similarly, 21 @ 9→(21 × 9) – 21 = 189 – 21 = 168
The required value is 168. Hence, the fourth option is correct.
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