Problema Solution
The weight W of an aluminum flatboat varies directly with the L length of the boat. If a 7-ft boat weighs 140 pounds, then what is the weight of a 9 ft boat?
Answer provided by our tutors
let x = the weight of the 9 ft boat
The weight W of an aluminum flatboat varies directly with the L length of the boat means:
W/L = k, where k is constant
using this fact we have:
140/7 = x/9
by solving we find:
x = 180 lbs
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the weight of the 9ft boat is 180 pounds.