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What are the third questions on page 22 and the eighth and ninth questions on page 23 of the first volume of sixth grade mathematics of People's Education Press? ! Solve ah ah! !
Xiaojun's plane model flew in the air for 6 minutes, and Xiaofeng's plane model flew by a third than Xiaojun's. How many minutes did Xiaofeng's model plane fly? Two questions on page 22

Today, the evening paper sold 120 copies, and the morning paper sold a quarter less than the evening paper. How many copies did the morning paper sell? Page 23, 8 questions

The incubation period of chickens is 2 1 day, and that of ducks is one third longer than that of chickens. How many days is the incubation period of ducks? 9 questions on page 23

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