Jade purchased a bottle of guava syrup to make drinks. She used ⁴₉ of the syrup in March. She then used the remaining syrup in April and May in the ratio 1 : 2. Given that the amount of the guava syrup used in March was 0.63 ℓ more than that in April, how many millilitres of guava syrup did the bottle contain at first?

March	April	May	Total
4x3	5x3		9x3
	1x5	2x5
12 u	5 u	10 u	27 u

Total volume of April and May is combined repeated identity.  Make the total volume of April and May the same.  LCM of 5 and 3 is 15.

Volume of more guava syrup in the bottle used in March than April
= 12 u - 5 u
= 7 u

7 u = 0.63 

1 u = 0.63 ÷ 7 = 0.09

Amount of guava syrup in the bottle at first
= 27 u
= 27 x 0.09
= 2.43 ℓ

1 ℓ = 1000 mℓ

Amount of guava syrup in the bottle at first
= 2.43 x 1000
= 2430 mℓ

Answer(s): 2430 mℓ