x:2.5::4:5

Question

I have no idea how to do this math

 

Answer 1

x:2.5::4:5

 

In English: x is to 2.5 as 4 is to 5

 

In fractions: x/2.5 = 4/5

 

Multiply both sides by 2.5:

 

x = 2.5 * 4/5 = 10/5 = 2