A bag contains blue marbles and red marbles, 31 in total. The number of blue marbles is 9 less than 3 times the number of red marbles. How many blue marbles are there?

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asked Nov 25, 2021 202k views

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A bag contains blue marbles and red marbles, 31 in total. The number of blue marbles is 9 less than 3 times the number of red marbles. How many blue marbles are there?

Mathematics
middle-school

AJ Gray asked

by AJ Gray

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1 Answer

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Answer:21 blue marbles

Explanation:

(3r-9)+r=31

4r-9=31

4r=40

r=10 Red marbles

B+

b+(10)=31

b=21 blue marbles

Wayoshi answered Nov 29, 2021

by Wayoshi

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