A: Eight.

2.2008- 1999+40=49 (years old)

A: I am 49 years old.

3. 1 hour 40 minutes = 100 minutes

2800/ 100=28 (m)

A: The average is 28 meters.

4, 200*360=72000 (square meters)

=7.2 hectares

A: 72,000 square meters, or 7.2 hectares.

72000*0.8=57600 (kg)

=57.6 (ton)

A: It can produce 57,600 kilograms of grain, or 57.6 tons.

5, 2 liters =2000 ml

2000/250=8 (Cup)

A: Eight cups.