A glass is 2 3 full. Then 40cm3 of orange juice is poured in. The glass is now 4 5 full. What is the total volume of the glass?

Answer 1

2/3 full + 40 cm^3 = 4/5 full

(2/3)F + 40 = (4/5)F

F(4/5-2/3) = 40

F(2/15) = 40

F = (15/2)40 = 300 cm^3 when full

200+40 = (4/5)300 = 240

total volume of the glass is 300 cubic centimeters= 3 m^3