Question

If z varies inversely as w and z=10 when w=0.7, how do you find z when w=40?

Answer 1

`z =280`

Explanation:

arrenge the inverse proportion `z/w`
`z_1=10`
`w_1 = 0.7`

`z_2 = z` find z
`w_2 = 40`

`z_1 / w_1 = z_2/ w_2`

`10 /0.7 = z_2/40`

`400 = 0.7z`

`z = 280`