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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 mar…

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 mar…
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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
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User Mikey G
by
8.2k points

2 Answers

2 votes
there are about 400 marbles
answered
User AmirNorouzpour
by
7.0k 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
answered
User Sdaz MacSkibbons
by
8.7k points
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