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3 December, 14:57

Jar contains 20 white marbles, 30 black marbles and some red marbles. Half of the marbles are black. What is the ratio of white to red marbles - how many marbles are in the the jar? - how can you find thee number of the red marbles?

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  1. 3 December, 16:41
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    Answer:the ratio of white to red marbles is 2:1

    The number of marbles in the jar is 60.

    The number of red marbles is 10

    Step-by-step explanation:

    Let x represent the total number of marbles in the bar.

    The jar contains 20 white marbles, 30 black marbles and some red marbles.

    Let r represent the number of red marbles. Therefore,

    20 + 30 + r = x

    Half of the marbles are black. This means that

    x/2 = 30

    x = 2 * 30 = 60

    Therefore,

    20 + 30 + r = 60

    50 + r = 60

    r = 60 - 50 = 10

    The ratio of white to red marbles would be

    20/10 = 2:1
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