Posted by AT on Thursday, February 4, 2010 at 10:24am.
Jim paid $3.99 for a 14-ounce bag of cookies. What was the
unit cost per pound?
- mathematics - drwls, Thursday, February 4, 2010 at 11:32am
$3.99 / (14/16 lb) = (8/7)*($3.99) = $4.56/lb
- mathematics - Anonymous, Friday, February 5, 2010 at 1:04am
More than one way to skin a cat. Proportions come up a lot and this can be solved as one.
State the relationship you need verbally.
"3.99 is to 14, as x is to 16"
Then set up a proportion.
---- = ----
14x = 16(3.99)
Divide both sides by 14, giving:
x = (16/14)3.99
x = (8/7)3.99
Finally, you need to pull out your calculator.
x = 31.92/7
x = 4.56
That is the cost per 16 ounces: that is, per pound.
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