Sabrina purchased a bottle of guava syrup to make drinks. She used ⁵₈ of the syrup in April. She then used the remaining syrup in May and June in the ratio 2 : 3. Given that the amount of the guava syrup used in April was 0.76 ℓ more than that in May, how many millilitres of guava syrup did the bottle contain at first?

April	May	June	Total
5x5	3x5		8x5
	2x3	3x3
25 u	6 u	9 u	40 u

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

Volume of more guava syrup in the bottle used in April than May
= 25 u - 6 u
= 19 u

19 u = 0.76 

1 u = 0.76 ÷ 19 = 0.04

Amount of guava syrup in the bottle at first
= 40 u
= 40 x 0.04
= 1.6 ℓ

1 ℓ = 1000 mℓ

Amount of guava syrup in the bottle at first
= 1.6 x 1000
= 1600 mℓ

Answer(s): 1600 mℓ