Betty purchased a bottle of pear syrup to make drinks. She used ³₅ of the syrup in January. She then used the remaining syrup in February and March in the ratio 4 : 5. Given that the amount of the pear syrup used in January was 0.76 ℓ more than that in February, how many millilitres of pear syrup did the bottle contain at first?

January	February	March	Total
3x9	2x9		5x9
	4x2	5x2
27 u	8 u	10 u	45 u

Total volume of February and March is combined repeated identity.  Make the total volume of February and March the same.  LCM of 2 and 9 is 18.

Volume of more pear syrup in the bottle used in January than February
= 27 u - 8 u
= 19 u

19 u = 0.76 

1 u = 0.76 ÷ 19 = 0.04

Amount of pear syrup in the bottle at first
= 45 u
= 45 x 0.04
= 1.8 ℓ

1 ℓ = 1000 mℓ

Amount of pear syrup in the bottle at first
= 1.8 x 1000
= 1800 mℓ

Answer(s): 1800 mℓ