PSLE
Usha had a bottle of juice. She drank 960 mℓ of juice in the morning and ²₇ of remaining juice in the evening. After that, there was ¹₃ a bottle of juice left. How much of the juice did she drink in the evening?
Fraction of the remaining juice left in the end
= 1 - ²₇
= ⁵₇

The remaining juice left in the end is equal to ¹₃ of the bottle of juice.
Make numerators the same.
LCM of 5 and 1 is 5.
 
⁵₇ of the remaining juice = ¹₃ of the total juice
⁵₇ of the remaining juice = ⁵₁₅ of the total juice

Volume of juice that she drank in the morning
= 15 u - 7 u
= 8 u

8 u = 960

1 u = 960 ÷ 8 = 120

Volume of juice that she drank in the evening
= 2 u
= 2 x 120
= 240 mℓ

Answer(s): 240 mℓ