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Question

Tick (✓) the correct answer:
If nn+15=49, then n = ?
(a) 4
(b) 6
(c) 9
(d) 12

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Solution

(d) 12

nn + 15 = 49 9n = 4 ( n + 15 ) 9n = 4n + 60 9n - 4n = 60 5n = 60 n = 605 = 12

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