1.

Solve :z/(z + 15) = 4/9

Answer»

z/(z + 15) = 4/9

On multiplying both sides by 9(z + 15), we obtain

9z = 4(z + 15)

⇒ 9z = 4z + 60

⇒ 9z − 4z = 60

⇒ 5z = 60

⇒ z = 12



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