Question

What does this mean? What do I have to do here?

"Which fraction is odd one out?
'15/25'
Pick one from below."

And the choices were...
27/45 3/5 16/20 6/10

Answer 1

actually all numerators are multiples of 3 and all denominators are multiples of 5 except in 16/20. you can ask me further more if you don't get it!