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The answer to the ninth question on page 17 of the second volume of the fifth grade of the Mathematics Book 10, 18, 12, 13, 14, 15.
9. Number of red-crowned cranes: 960 (2.2+ 1)=300.

Number of swans: 960-300=660 (only)

10, fifth-grade tree planting: 24( 1.5- 1)= 48 (plants)

Planting trees in the sixth grade: 48× 1.5=72 (plants)

Speed 1 1 and B: 2 16÷2.4-42=48 (km/h)

12, meeting time: 274.08 ÷ (118.4+10) =1.2 (hours).

13, (83- 12×4)÷7=5 (Ben)

14,6000 ÷ 25-130 =110 (word)

15, 1520÷ 16-60=35 (yuan)

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