Question 700503
let there be x tickets at £2 and y tickets at £4

given total tickets  =  x+y= 10  -----------(1)
total cost = cost of £2 tickets + cost of £4 tickets= 2x+4y =36----(2)

so we have 
x+y= 10  -----------(1)
2x+4y =36----(2)

(2)- 2*(1) gives  2y=16 , y=8
from (1)  gives   x=2

he buys two £2 tickets and 8 £4 tickets