Irene purchased a bottle of vinegar. She used ²₅ of the vinegar in April. She then used the remaining vinegar in May and June in the ratio 3 : 4. Given that the amount of the vinegar used in June was 0.08 ℓ less than that in April, how many millilitres of vinegar did the bottle contain at first?

April	May	June	Total
2x7	3x7		5x7
	3x3	4x3
14 u	9 u	12 u	35 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 7 is 21.

Volume of less vinegar syrup in the bottle used in June than April
= 14 u - 12 u
= 2 u

2 u = 0.08 

1 u = 0.08 ÷ 2 = 0.04

Amount of vinegar in the bottle at first
= 35 u
= 35 x 0.04
= 1.4 ℓ

1 ℓ = 1000 mℓ

Amount of vinegar in the bottle at first
= 1.4 x 1000
= 1400 mℓ

Answer(s): 1400 mℓ