SOLUTION: A bag contains blue marbles and red marbles, 71 in total. The number of blue marbles is 1 less than 3 times the number of red marbles. How many blue marbles are there?

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Question 1099157: A bag contains blue marbles and red marbles, 71 in total. The number of blue marbles is 1 less than 3 times the number of red marbles. How many blue marbles are there?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
B%2BR=71
B=3R-1
Substituting,
3R-1%2BR=71
4R=72
Solve for R, then use either equation to solve for B.