PSLE
Kathy had a bottle of orange juice. She drank 1050 mℓ of orange juice in the afternoon and ³₅ of remaining orange juice at night. After that, there was ¹₆ 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 ¹₆ of the bottle of orange juice.
Make numerators the same.
LCM of 2 and 1 is 2.
 
²₅ of the remaining orange juice = ¹₆ of the total orange juice
²₅ of the remaining orange juice = ²₁₂ of the total orange juice

Volume of orange juice that she drank in the afternoon
= 12 u - 5 u
= 7 u

7 u = 1050

1 u = 1050 ÷ 7 = 150

Volume of orange juice that she drank at night
= 3 u
= 3 x 150
= 450 mℓ

Answer(s): 450 mℓ