Posted by lidia on Monday, September 10, 2012 at 8:12pm.
At the pet store ruth bought 5 rawhide bones and 3 dog collars.She gave the cashier 90$ and received $6 in chage.If a dog collar costs 3 times as much as a bone find the cost of one dog collar.
My answer is 63 am i right if not please show me why and how.

aig math (Ms.Sue)  Ms. Sue, Monday, September 10, 2012 at 8:16pm
Your answer is obviously wrong. She bought 3 collars. If she paid 63 for one collar  then she would have paid 189 for three.

aig math (Ms.Sue)  lidia, Monday, September 10, 2012 at 8:28pm
so is the answer 21?

aig math (Ms.Sue)  Ms. Sue, Monday, September 10, 2012 at 8:31pm
Let's check:
(3 * 21) + (5 * 7) = 98
Nope  you're getting closer.

aig math (Ms.Sue)  lidia, Monday, September 10, 2012 at 8:41pm
is it 18.

aig math (Ms.Sue)  Ms. Sue, Monday, September 10, 2012 at 8:45pm
Let's check.
(3 * 18) + (5 * 6) = 84
Right!!!

aig math (Ms.Sue)  lidia, Monday, September 10, 2012 at 8:50pm
my mother dosen't under how you get 18 can you please explain.

aig math (Ms.Sue)  Ms. Sue, Monday, September 10, 2012 at 8:53pm
I don't know. I found the right answer by trial and error.
Lidia I'm not a math teacher  so please don't include my name on your future posts.

aig math (Ms.Sue)  Reiny, Monday, September 10, 2012 at 9:09pm
cost of bone  x
cost of collar  3x
5 bones + 3 collars = 84
5x + 3(3x) = 84
14x = 84
x = 84/14 = 6
cost of bone = $6
cost of collar = 3(6) = $18

aig math (Ms.Sue)  Ms. Sue, Monday, September 10, 2012 at 9:19pm
Thanks, Reiny!
I hope Lidia sees your answer.
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