Brandon and Reggie each had the same volume of water. The water was used to pour into identical bottles. Brandon filled up 11 bottles and had 3.8 ℓ of water left. Reggie filled up 9 bottles and had 5.2 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 Brandon and Reggie had at first? Give your answer in litres.

(a)
Difference between the number of bottles
= 11 - 9
= 2

Difference between the volume of water left
= 5.2 - 3.8
= 1.4 ℓ

Volume of 2 bottles = 1.4 ℓ

Volume of 1 bottle
= 1.4 ÷ 2
= 0.7 ℓ

1 ℓ = 1000 mℓ
0.7 ℓ = 0.7 x 1000 = 700 mℓ

(b)
Volume of 9 bottles 
= 9 x 0.7
= 6.3 ℓ

Volume of water that Reggie had at first
= 6.3 + 5.2
= 11.5 ℓ

Total volume of water that Brandon and Reggie had at first
= 2 x 11.5
= 23 ℓ

Answer(s): (a) 700 mℓ (b) 23 ℓ