Question

solve the equation: z/z+15=4/9​

Answer 1

Answer:

z=12

Step-by-step explanation:

z/z+15=4/9

by cross multiplication

9z=4z+60

9z-4z=60

5z=60

z=12

Answer 2

$\frac{z}{z + 15} = \frac{4}{9} \\ 9z = 4(z + 15) \\ 9z = 4z + 60 \\ 9z - 4z = 60 \\ 5z = 60 \\ z = \frac{60}{5} \\ z = 12$