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Naughty smiles in elementary school math books.
1)

Naughty: 1500÷75=20 points

Smile: 1260÷60=2 1.

20 & lt2 1

So naughty goes to school first.

2)

7:30+2 1=7:5 1

7: 5 1 later than 7: 50

So smiling will be late.

Han Ying Nuannuan

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