Question

Suppose p varies directly as d, and p = 2 when d = 7. What is the value of d when p = 10?

Is the answer d = 20/7?

Answer 1

directly is a p/d = k type relation

Answer 2

my possible answers are
A.
d = 35

B.
d = 15

C.

d = 7/5


D.

d = 20/7

Answer 3

k = 2/7 regardless

10/d = 2/7

id go 70/2 perhaps

Answer 4

70/2 = 35 :)

Answer 5

p varies directly as d => p=kd
p = 2 when d = 7 => k=2/7
p=2/7 d
d= 7/2 p
d= 70/2

Answer 6

Thank you!

Answer 7

p = 10 * 7/2 = 35