Question

If z/(z + 15) = 4/9 , then the value of 'z'​

Answer 1

=> z = 12

Step-by-step explanation:

$= > \frac{z}{z + 15} = \frac{4}{9} \\ = > \bf{ by \: cross \: multiplication} \\ = > 9z = 4(z + 15) \\ = > 9z = 4z + 60 \\ = > 9z - 4z = 60 \\ = > 5z = 60 \\ = > z = \frac{60}{5 } \\ = > \boxed{z = 12}$

Answer 2

Step-by-step explanation:

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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