answer only 4 and 6 .....
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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
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