Question

x varies as 1/y. If x=25 , then y=10.

Answer 1

Answer:

y = k/x

1/2 = k/10

Multiply both sides by 10:

10/2 = k

k = 5

k is the constant.

So when y = 25, then

25 = 5/x

Multiply both sides by x:

25x = 5

Divide by 5:

x = 1/5

Answer 2

the answer is y=150/20=7.5