Which phrase does not match the others about ratios?

Question

Which ratio does not belong w/the other three?

2 parts to 5 parts

2 out of every 5

2 for each 5

2 for every 5

Answer 1

2 out of every 5 is different. There are 5 parts total. 2 parts of something and 3 parts of something else.

The other three have 7 parts total. 2 parts of something and 5 parts of something else.