Question

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

Answer 1

105÷3=35 so you would do 8×35 and get 280

Answer 2

Value of D when t is 8 is:

280

Explanation:

If D varies directly with t

⇒ D=kt for some constant k

D is 105 when t is 3

⇒ 105=3k

⇒ k=105/3

⇒ k=35

⇒ D=35t

when t=8

D=35×8

⇒ D=280

Hence, Value of D when t is 8 is:

280