A container filled with 12 durians has a mass of 11.67 kg. The same container when filled with 8 passion fruits has a mass of 1.79 kg. The mass of 1 durian is five times the mass of 1 passion fruit. Find the mass of the container when it is empty. Express the answer in g.
1 kg = 1000 g

11.67 kg = 11670 g
1.79 kg = 1790 g

1 passion fruit = 1 u
8 passion fruits = 8 x 1 u = 8 u

1 container + 8 passion fruits = 1790
1 container + 8 u = 1790 --- (1)

1 durian = 5 u
12 durians = 12 x 5 u = 60 u

1 container + 12 durians = 11670
1 container + 60 u = 11670 --- (2)

(2) - (1)
60 u - 8 u = 11670 - 1790
52 u = 9880

1 u = 9880 ÷ 52 = 190

8 u = 8 x 190 = 1520

From (1):
1 container + 8 u = 1790
1 container + 1520 = 1790
 
1 container = 1790 - 1520 = 270

Mass of 1 container = 270 g

Answer(s): 270 g