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In a certain code, 8 $ 2 = 60 and 5 $ 3 = 48. Following the same rule, what is the value of 5 $ 4?

1. 52
2. 44
3. 48
4. 54

Correct answer: 54

Solution

The rule is (a + b) x 6: for 8 $ 2, (8 + 2) x 6 = 60, and for 5 $ 3, (5 + 3) x 6 = 48. Applying it to 5 $ 4 gives (5 + 4) x 6 = 54.

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