How do I work out a bus carrys 47 passengers how many buses are needed to carry 1222 passengers

$${\frac{{\mathtt{1\,222}}}{{\mathtt{47}}}} = {\mathtt{26}}$$

Since each bus holds 47 passengers, divide the number of passengers (1222) by 47 to get the number of busses that you need.

If the quotient is a whole number, fine, that's your answer; if it isn't a whole number, you'll have to increase the quotient by 1, so you don't leave any passengers behind.