Question

S varies directly as t. if s is 20 when t is 4 then t is ____ when s is 30

Answer 1

Explanation:

s = 20, t = 4

s = 30, t =?

`(20)/(4) = (30)/(t)`

`20t = 120 \\t = 6`

∴ t is 6 when s is 30.