SOLUTION: There are red and blue marbles in a jar. One third of the marbles are red. If one more red marble is put in the jar, then 3/8 of the marbles are red. How many blue marbles are in t

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Question 235827: There are red and blue marbles in a jar. One third of the marbles are red. If one more red marble is put in the jar, then 3/8 of the marbles are red. How many blue marbles are in the jar?
Answer by solver91311(12126) (Show Source):
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Let represent the number of red marbles. Let represent the total number of marbles.

We are given that

and

Because if you increase the number of red marbles by 1, you have also increased the total number of marbles by 1.

Equivalent expressions:

Substituting:

Solve for , then multiply by 3 to get , then subtract from

John