Question : Directions: If 6 * 9 – 4 = 58 and 3 * 9 – 7 = 34, then in the expression, A * 4 – 9 = 91, what is the value of A?
Option 1: 6.5
Option 2: 17.5
Option 3: 20.5
Option 4: 30.5
Correct Answer: 20.5
Solution :
Given:
6 * 9 – 4 = 58 and 3 * 9 – 7 = 34
Like, 6 * 9 – 4 = 58→(6 × 9) + 4 = 54 + 4 = 58
3 * 9 – 7 = 34→(9 × 3) + 7 = 27 + 7 = 34
Similarly, A * 4 – 9 = 91
⇒ (A × 4) + 9 = 91
⇒ A × 4 = 91 – 9
⇒ A × 4 = 82
⇒ A = 82 ÷ 4
⇒ A = 20.5
Hence, the third option is correct.
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