A container filled with 13 king melons has a mass of 11.12 kg. The same container when filled with 9 chikoos has a mass of 1.46 kg. The mass of 1 king melon is six times the mass of 1 chikoo. Find the mass of the container when it is empty. Express the answer in g.
1 kg = 1000 g

11.12 kg = 11120 g
1.46 kg = 1460 g

1 chikoo = 1 u
9 chikoos = 9 x 1 u = 9 u

1 container + 9 chikoos = 1460
1 container + 9 u = 1460 --- (1)

1 king melon = 6 u
13 king melons = 13 x 6 u = 78 u

1 container + 13 king melons = 11120
1 container + 78 u = 11120 --- (2)

(2) - (1)
78 u - 9 u = 11120 - 1460
69 u = 9660

1 u = 9660 ÷ 69 = 140

9 u = 9 x 140 = 1260

From (1):
1 container + 9 u = 1460
1 container + 1260 = 1460
 
1 container = 1460 - 1260 = 200

Mass of 1 container = 200 g

Answer(s): 200 g