Question

find the value of a​

Answer 1

a should be 1 most probably

Answer 2

HEY MATE HERE IS YOUR ANSWER!!

Answer:

In triangle ABC,

Lets name the parallel line EF

EF is parallel BC

by using Basic proportionality theorem (BPT)

AE/EB=AF/FC

a/3=5/15

therefore, a=1

hope this helps you !!