Abi purchased a bottle of wine. She used ⁷₉ of the wine in January. She then used the remaining wine in February and March in the ratio 4 : 5. Given that the amount of the wine used in March was 1.06 ℓ less than that in January, how many millilitres of wine did the bottle contain at first?

January	February	March	Total
7x9	2x9		9x9
	4x2	5x2
63 u	8 u	10 u	81 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 less wine syrup in the bottle used in March than January
= 63 u - 10 u
= 53 u

53 u = 1.06 

1 u = 1.06 ÷ 53 = 0.02

Amount of wine in the bottle at first
= 81 u
= 81 x 0.02
= 1.62 ℓ

1 ℓ = 1000 mℓ

Amount of wine in the bottle at first
= 1.62 x 1000
= 1620 mℓ

Answer(s): 1620 mℓ