Question : Directions: If 38 # 49 = 24 and 96 # 51 = 21, then 87 # 78 = ?
Option 1: 26
Option 2: 21
Option 3: 28
Option 4: 30
Correct Answer: 30
Solution :
Given:
38 # 49 = 24 and 96 # 51 = 21, then 87 # 78 = ?
Add the digits of both the numbers in the L.H.S. to get the number given in the R.H.S.
Like, 38 # 49 ⇒ (3 + 8) + (4 + 9) = 11 + 13 = 24
And, 96 # 51 ⇒ (9 + 6) + (5 + 1) = 15 + 6 = 21
Similarly, 87 # 78 ⇒ (8 + 7) + (7 + 8) = 15 + 15 = 30
So, 30 is the answer to the given equation. Hence, the fourth option is correct.
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