Step-by-step explanation:
4. 4+11=15
to find the length of The first piece
4/15*75=20
to find the length of the second one
11/15*75=55
5. 4+1=5
to find the length of the first one
4/5*180=144
to find the length of the second one
1/5*180=36
7. 5+7+8=20
to find the length of the first one
5/20*40=10
to find the length of the second one
7/20*40=14
to find the length of the third one
8/20*40=16