Solve for f(x)

x f(x)

100 ?

60 24

45 18

30 12

How do you solve for ? Thanks!

Compare x and f(x) values. The ratio of f(x) and x is the same.

That is 24/60 = 2/5

Similarly 18/45 = 2/5

In other words , 18 = (2/5) *45

So f(x ) = (2/5) * x

So f(x) when x = 100 is (2/5) * x = 40

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