Suppose f varies inversely with g and that f=20 when g=4. What is the value of f when g=10?

Answer 1

f varies inversely with g:
f = k * (1/g)
where k is some constant.

f=20 when g=4:
20 = k * (1/4)
k = 20 * 4
k = 80

f=? when g=10
f = 80 * (1/10)
f = 8

Hope this helps~ `u`

Answer 2

another way. You do not need to find k at all. You know that

f = k/g, so
fg = k, a constant.

That means that

20*4 = f*10

Answer 3

I have 18 in the denominator.
I am equivalent to 1\6.
What fraction am i? ?

Answer 4

1/6 = x/18
Solve for x.