A container filled with 15 jackfruits has a mass of 17.32 kg. The same container when filled with 3 chikoos has a mass of 0.79 kg. The mass of 1 jackfruit 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

17.32 kg = 17320 g
0.79 kg = 790 g

1 chikoo = 1 u
3 chikoos = 3 x 1 u = 3 u

1 container + 3 chikoos = 790
1 container + 3 u = 790 --- (1)

1 jackfruit = 6 u
15 jackfruits = 15 x 6 u = 90 u

1 container + 15 jackfruits = 17320
1 container + 90 u = 17320 --- (2)

(2) - (1)
90 u - 3 u = 17320 - 790
87 u = 16530

1 u = 16530 ÷ 87 = 190

3 u = 3 x 190 = 570

From (1):
1 container + 3 u = 790
1 container + 570 = 790
 
1 container = 790 - 570 = 220

Mass of 1 container = 220 g

Answer(s): 220 g