Question

If D varies directly with t and D is 105 when t is 3 find D when t is 8

Answer 1

D ∝ t

implies

D = Kt

substituting D = 105 and t =3

implies 105 = K x 3

therefore K = 105/3

K = 35

The formula then becomes

D = 35t

When t = 8

D = 35 x 8

D = 280

Explanation: