Triangle abc is similar to triangle def. what is the length of ef? correct answer gets brainliest.

Hey there! :D

We can find the scale of the numbers. 

5/3= 1.66666667 or 1 2/3

Now, just multiply that by 7.5.

7.5* 1 2/3= 4.4999 (round to 4.5)

4.5 is your answer. 

I hope this helps!
~kaikers

EF/7.5=3/5
EF=7.5•3/5
EF= 4.5

Ireally don’t understand your problem do you have a better picture of it