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Question

Tick (✓) the correct answer:
If z=45(z+10), then z = ?
(a) 40
(b) 20
(c) 10
(d) 60

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Solution

(a) 40

z = 45 ( z + 10 ) 5z = 4 ( z + 10 ) 5z = 4z + 40 5z - 4z = 40 z = 40

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