SOLUTION: I am working on these types of word problems and I just don't understand how to set it up my word problem is: the cost of nails varies directly with the number of pounds bought. If

Question 996001: I am working on these types of word problems and I just don't understand how to set it up my word problem is: the cost of nails varies directly with the number of pounds bought. If 4 pounds of nails cost 11.60, what is the cost of 3.5 pounds? If I could just see an example of how to set a problem like this up it would be greatly appreciated

Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
.
X=cost of 3.5 lbs
.
Set up as a ratio:

.
Look at what is happening: The left side is
calculating the price per pound, so when we multiply
by 3.5lbs, we are multiplying cost per pound by pounds:
.

.
(Notice the price per pound is 2.90)

.
ANSWER: The price of 3.5 pounds is 10.15.

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