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in a class of 38 children,19 play tennis, 21 play squash and 10 play neither sport. (1)how many children play both sports?(2)how many children play only tennis

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28 play some sport

19+21-both=28
both = 12

tennis only = 19-12 = 7

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Isn't 19 + 21 + 40 which is more than the amount of children in the class? Then you add 10 more that don't play it's 50. So how is the class total 38 as implied?

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Where did u get the 12 from

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there are 4 green marbles,5 blue marbles,and 6 purples marble.

1. What the probability of picking a red marble, not replacing it, then picking a purple marble?

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