Diana purchased a bottle of maple syrup. She used ³₇ of the maple syrup in March. She then used the remaining maple syrup in April and May in the ratio 2 : 3. Given that the amount of the maple syrup used in May was 0.09 ℓ less than that in March, how many millilitres of maple syrup did the bottle contain at first?

March	April	May	Total
3x5	4x5		7x5
	2x4	3x4
15 u	8 u	12 u	35 u

Total volume of April and May is combined repeated identity. Make the total volume of April and May the same. LCM of 4 and 5 is 20.

Volume of less maple syrup syrup in the bottle used in May than March
= 15 u - 12 u
= 3 u

3 u = 0.09 

1 u = 0.09 ÷ 3 = 0.03

Amount of maple syrup in the bottle at first
= 35 u
= 35 x 0.03
= 1.05 ℓ

1 ℓ = 1000 mℓ

Amount of maple syrup in the bottle at first
= 1.05 x 1000
= 1050 mℓ

Answer(s): 1050 mℓ