PSLE
Shannon had a bottle of orange juice. She drank 900 mℓ of orange juice in the evening and ³₅ of remaining orange juice at night. After that, there was ¹₁₀ a bottle of orange juice left. How much of the orange juice did she drink at night?
Fraction of the remaining orange juice left in the end
= 1 - ³₅
= ²₅

The remaining orange juice left in the end is equal to ¹₁₀ of the bottle of orange juice.
Make numerators the same.
LCM of 2 and 1 is 2.
 
²₅ of the remaining orange juice = ¹₁₀ of the total orange juice
²₅ of the remaining orange juice = ²₂₀ of the total orange juice

Volume of orange juice that she drank in the evening
= 20 u - 5 u
= 15 u

15 u = 900

1 u = 900 ÷ 15 = 60

Volume of orange juice that she drank at night
= 3 u
= 3 x 60
= 180 mℓ

Answer(s): 180 mℓ