assuming all are adults:
1800x$4=$7200difference between above and original:$7200-$6000=$1200difference between prices of adult and child tickets:$4-$2=$2no. of children:$1200/2=600
*At my school, once you've found ur final answer, double-underline your answer and write this: "(ans)" beside it. That way, when you forget to write down the answer in the answer blank, the teacher will see you've alr marked down the answer in your working and she'll mark you correct. Just saying, cos Idk how it works in different schools. :) *
