Question

A 90 pound coil of cable is 300 feet long if a 30 foot length cable is cut off what is the weight of the remaining cable

Answer 1

81 lb

Explanation:

30 feet is 1/10 of the length.....9/10 of the length remains...so does 9/10 of the weight

9/10 * 90 lb = 81 lb

Answer 2

Answer: 81 pound.

Explanation:

A 1 foot reel of cable weighs:

`\displaystyle\\(90)/(300) =(3)/(10)\ (pound)/(foot) .`

A 30 foot reel of cable weighs:

`\displaystyle\\(3)/(10)*30=\\\\(90)/(10) =\\\\9\ pound.`

The weight of the remaining cable is:

`90-9=\\\\81 \ pound.`