John has 30 marbles. He gives 9 marbles to his brother. How many marbles does he have left?
A
230
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B
21
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C
39
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D
270
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Solution
The correct option is B 21 John has 30 marbles. He gives 9 marbles to his brother.
We can find the number of marbles left with John by subtracting 9 from 30.