A small taxi can take 4 passengers. A large taxi can take 6 passengers.
(a) Work out the total number of passengers that 3 small taxis and 2 large taxis can take.
(b) s small taxis and l large taxis can take 40 passengers.
(i) Write a function to show this.
(ii) There are 7 small taxis. Work out the number of large taxis.