Civil Service Exam Reviewer · Logical Reasoning · hard

If 8 ★ 5 = 169, 9 ★ 4 = 169, then 7 ★ 5 = ?

1. 144
2. 74
3. 24
4. 47

Answer

A. 144

Solution

The rule is a ★ b = (a + b)². Check: 8 ★ 5 → 169; 9 ★ 4 → 169. So 7 ★ 5 = 144.

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