A bottle has mass of 1.8 kilograms when its completly filled with juice.It hass a mass of 1.23 kilograms when 3/8 of juice is removed.What is the mass of the empty bottle.

Answer 1

j + b = 1.8
5/8 j + b = 1.23
so
(5/8)(1.8-b) + b = 1.23
0.9 + (3/8) b = 1.23
3 b = 0.33*8
b = 0.11*8 = 0.88