A container filled with 11 honeydews has a mass of 13.39 kg. The same container when filled with 6 persimmons has a mass of 1.39 kg. The mass of 1 honeydew is six times the mass of 1 persimmon. Find the mass of the container when it is empty. Express the answer in g.
1 kg = 1000 g

13.39 kg = 13390 g
1.39 kg = 1390 g

1 persimmon = 1 u
6 persimmons = 6 x 1 u = 6 u

1 container + 6 persimmons = 1390
1 container + 6 u = 1390 --- (1)

1 honeydew = 6 u
11 honeydews = 11 x 6 u = 66 u

1 container + 11 honeydews = 13390
1 container + 66 u = 13390 --- (2)

(2) - (1)
66 u - 6 u = 13390 - 1390
60 u = 12000

1 u = 12000 ÷ 60 = 200

6 u = 6 x 200 = 1200

From (1):
1 container + 6 u = 1390
1 container + 1200 = 1390
 
1 container = 1390 - 1200 = 190

Mass of 1 container = 190 g

Answer(s): 190 g