A container filled with 14 mangoes has a mass of 22.64 kg. The same container when filled with 4 starfruits has a mass of 1.04 kg. The mass of 1 mango is eight times the mass of 1 starfruit. Find the mass of the container when it is empty. Express the answer in g.
1 kg = 1000 g

22.64 kg = 22640 g
1.04 kg = 1040 g

1 starfruit = 1 u
4 starfruits = 4 x 1 u = 4 u

1 container + 4 starfruits = 1040
1 container + 4 u = 1040 --- (1)

1 mango = 8 u
14 mangoes = 14 x 8 u = 112 u

1 container + 14 mangoes = 22640
1 container + 112 u = 22640 --- (2)

(2) - (1)
112 u - 4 u = 22640 - 1040
108 u = 21600

1 u = 21600 ÷ 108 = 200

4 u = 4 x 200 = 800

From (1):
1 container + 4 u = 1040
1 container + 800 = 1040
 
1 container = 1040 - 800 = 240

Mass of 1 container = 240 g

Answer(s): 240 g