# Math

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Ms. Sue, help me. I don't get the runners problem. Please i am helpless!!!

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See below.

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I mean i don' t get why 22-7?

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because 7 ran both times.

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I still do not get it

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Ms. Sue or Steve can explain more.

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Tutor, help me. :(

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22 run in the morning. But 7 of these run at night, also. That means that 15 run only in the morning.

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Can you give me a sample problem like that to see if I get.

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Of 20 families on our block, 8 have a dog and 5 have a cat. Three families have both a dog and a cat. How many have only a dog?

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