Question

answer only 4 and 6 ..... ​

Answer 1

Answer:

for question 4 20m

Explanation:

let y be the total length

Then

1/4 of y+1/5 of y+11=y

y/4+y/5+11=y

4y+5y/20=y-11

9y/20=y-11

9y=20y-220

11y=220

y=220/11

y=20m