Dana purchased a bottle of pear syrup to make drinks. She used ²₇ of the syrup in February. She then used the remaining syrup in March and April in the ratio 1 : 3. Given that the amount of the pear syrup used in February was 0.12 ℓ more than that in March, how many millilitres of pear syrup did the bottle contain at first?

February	March	April	Total
2x4	5x4		7x4
	1x5	3x5
8 u	5 u	15 u	28 u

Total volume of March and April is combined repeated identity.  Make the total volume of March and April the same.  LCM of 5 and 4 is 20.

Volume of more pear syrup in the bottle used in February than March
= 8 u - 5 u
= 3 u

3 u = 0.12 

1 u = 0.12 ÷ 3 = 0.04

Amount of pear syrup in the bottle at first
= 28 u
= 28 x 0.04
= 1.12 ℓ

1 ℓ = 1000 mℓ

Amount of pear syrup in the bottle at first
= 1.12 x 1000
= 1120 mℓ

Answer(s): 1120 mℓ