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A bag is filled with marbles. You take out and mark 80 marbles. Then you put the marbles back in the bag and mix the marbles. In a sample of 20 marbles, 4 of the marbles are marked. About how many marbles
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A bag is filled with marbles. You take out and mark 80 marbles. Then you put the marbles back in the bag and mix the marbles. In a sample of 20 marbles, 4 of the marbles are marked. About how many marbles are in the bag?

A bag is filled with marbles. You take out and mark 80 marbles. Then you put the marbles-example-1
User Mikey G
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2 Answers

2 votes
there are about 400 marbles
User AmirNorouzpour
by
5.3k points
7 votes
About 400 marbles. You simply set up a proportion and solve it as I did in the photo attached.
A bag is filled with marbles. You take out and mark 80 marbles. Then you put the marbles-example-1
User Sdaz MacSkibbons
by
6.5k points
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