A container filled with 10 honeydews has a mass of 6.22 kg. The same container when filled with 5 kiwis has a mass of 0.82 kg. The mass of 1 honeydew is five times the mass of 1 kiwi. Find the mass of the container when it is empty. Express the answer in g.
1 kg = 1000 g

6.22 kg = 6220 g
0.82 kg = 820 g

1 kiwi = 1 u
5 kiwis = 5 x 1 u = 5 u

1 container + 5 kiwis = 820
1 container + 5 u = 820 --- (1)

1 honeydew = 5 u
10 honeydews = 10 x 5 u = 50 u

1 container + 10 honeydews = 6220
1 container + 50 u = 6220 --- (2)

(2) - (1)
50 u - 5 u = 6220 - 820
45 u = 5400

1 u = 5400 ÷ 45 = 120

5 u = 5 x 120 = 600

From (1):
1 container + 5 u = 820
1 container + 600 = 820
 
1 container = 820 - 600 = 220

Mass of 1 container = 220 g

Answer(s): 220 g