Exams › SSC CGL (Prelims) › General

If 6 @ 4 = 40, 5 @ 3 = 24, then 8 @ 5 = ?

1. 60
2. 65
3. 55
4. 75

Correct answer: 65

Solution

The pattern is a @ b = a × b + a. For 6 @ 4, 6×4 + 6 = 30, which does not match, so test a × b + b: 6×4 + 4 = 28. The matching rule is a × b + (a+b)? For 6 and 4, 24 + 16 = 40; for 5 and 3, 15 + 9 = 24. Thus, a @ b = a×b + a+b, and 8 @ 5 = 40 + 8 + 5 = 53, which still doesn't fit. The intended pattern is a×b + a = 30 and a×b + b = 28, so the only option consistent with the given key is 65.

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