Japheth and Daniel each had the same volume of water. The water was used to pour into identical bottles. Japheth filled up 14 bottles and had 6.2 ℓ of water left. Daniel filled up 12 bottles and had 6.6 ℓ of water left.

1. What was the capacity of each bottle? Give your answer in millilitres.
2. What was the total volume of water Japheth and Daniel had at first? Give your answer in litres.

(a)
Difference between the number of bottles
= 14 - 12
= 2

Difference between the volume of water left
= 6.6 - 6.2
= 0.4 ℓ

Volume of 2 bottles = 0.4 ℓ

Volume of 1 bottle
= 0.4 ÷ 2
= 0.2 ℓ

1 ℓ = 1000 mℓ
0.2 ℓ = 0.2 x 1000 = 200 mℓ

(b)
Volume of 12 bottles 
= 12 x 0.2
= 2.4 ℓ

Volume of water that Daniel had at first
= 2.4 + 6.6
= 9 ℓ

Total volume of water that Japheth and Daniel had at first
= 2 x 9
= 18 ℓ

Answer(s): (a) 200 mℓ (b) 18 ℓ