A school laboratory has two types of conical flask. Large conical flasks can hold 1.6 litres and small conical flasks can hold 600 ml. a) Mark has f large flasks and w small flasks, all full of hydrochloric acid. Write an expression for how many millilitres (ml) of acid he has. b) Bev has 2f large flasks and 2w small flasks, all full of hydrochloric acid. Write an expression for how many millilitres (ml) of acid she has. ​