Min purchased a bottle of pear syrup to make drinks. She used ¹₅ of the syrup in February. She then used the remaining syrup in March and April in the ratio 1 : 9. Given that the amount of the pear syrup used in February was 0.27 ℓ more than that in March, how many millilitres of pear syrup did the bottle contain at first?

February	March	April	Total
1x5	4x5		5x5
	1x2	9x2
5 u	2 u	18 u	25 u

Total volume of March and April is combined repeated identity.  Make the total volume of March and April the same.  LCM of 4 and 10 is 20.

Volume of more pear syrup in the bottle used in February than March
= 5 u - 2 u
= 3 u

3 u = 0.27 

1 u = 0.27 ÷ 3 = 0.09

Amount of pear syrup in the bottle at first
= 25 u
= 25 x 0.09
= 2.25 ℓ

1 ℓ = 1000 mℓ

Amount of pear syrup in the bottle at first
= 2.25 x 1000
= 2250 mℓ

Answer(s): 2250 mℓ