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29 September, 09:00

A bag contains red and green marbles. The probability of choosing red marble at random is 2/5.

a) what is the probability of choosing a green marble at random?

b) if I add another 7 red marbles to the bag, the probability of choosing a red marble changed to 1/2. How many marbles are there in the bag now?

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  1. 29 September, 09:16
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    A) 3/5 is the probability of choosing a green marble at random.

    B) 42 marbles are in the bag. Before adding the 7 additional marbles, you have 35 marbles. 21 of those marbles were green, and 14 were red. By adding 7 red marbles, you will now have 21 red marbles and 21 green marbles, making the probability of choosing either color 1/2.
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