PSLE
Nora had a bottle of orange juice. She drank 660 mℓ of orange juice in the morning and ³₅ of remaining orange juice in the afternoon. After that, there was ¹₈ a bottle of orange juice left. How much of the orange juice did she drink in the afternoon?
Fraction of the remaining orange juice left in the end
= 1 - ³₅
= ²₅

The remaining orange juice left in the end is equal to ¹₈ of the bottle of orange juice.
Make numerators the same.
LCM of 2 and 1 is 2.
 
²₅ of the remaining orange juice = ¹₈ of the total orange juice
²₅ of the remaining orange juice = ²₁₆ of the total orange juice

Volume of orange juice that she drank in the morning
= 16 u - 5 u
= 11 u

11 u = 660

1 u = 660 ÷ 11 = 60

Volume of orange juice that she drank in the afternoon
= 3 u
= 3 x 60
= 180 mℓ

Answer(s): 180 mℓ