Question 129117
Let x be the number of sections of 18' pipe.
main length=pipe length * number of sections of pipe
20(x-14)=18x
20x-280=18x
20x-18x-280+280=18x-18x+280
2x=280
2x/2=280/2
x=140
18*140=2520' Length of main.
Check:
20(140-14)=20*126=2520
.
Ed