Doughnuts

SILVER

New member
Joined
Jan 27, 2011
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Im stuck on this problem. The answer is eight pounds, but how do you get there?

Four chocolate Waddle doughnuts and a jelly doughnut weigh 20 pounds. Nine chocolate Waddle doughnuts and two jelly doughnuts weigh 43 pounds. How much does a jelly doughnut weigh?
 

soroban

Elite Member
Joined
Jan 28, 2005
Messages
5,588
Hello, SILVER!

I'm stuck on this problem. The answer is eight pounds, but how do you get there?

Four chocolate Waddle doughnuts and a jelly doughnut weigh 20 pounds.
Nine chocolate Waddle doughnuts and two jelly doughnuts weigh 43 pounds.
How much does a jelly doughnut weigh?

Let C = weight of a chocolate donut.
Let J = weight of a jelly donut.

The two statements give us these two equations:

. . 4C + .J .= .20
. . 9C + 2J .= .43

Now so=olve the system . . .

 
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