Jake brought a mattress for $425.50. He had a mail in rebate for $75.00. How much money did he save after using his rebate?
2 answers:
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Let 
the number of white marbles in Jar 1
Let
the number of white marbles in Jar 2
Total number of white marbles is
Jar 1 has
white marbles and 
red marbles so 
marbles total
Jar 2 has
white marbles and 
red marbles so 
marbles total
Since both jars have equal amounts of marbles,
We have a system of equations:
The number of red marbles in Jar 2 is so we solve for
⇒
⇒
⇒
⇒
Number of red marbles in Jar 2 is
So there are 360 red marbles in Jar 2.
Let
Total number of white marbles is
Jar 1 has
Jar 2 has
Since both jars have equal amounts of marbles,
We have a system of equations:
The number of red marbles in Jar 2 is
⇒
⇒
⇒
⇒
Number of red marbles in Jar 2 is
So there are 360 red marbles in Jar 2.