[Question]: A pen costs $9 more than a pencil. If a pencil costs $2, find the total cost of both items.
[Answer]: A pen costs $9 more than $2 which is $9 + $2 = $11. Altogether they cost $11 + $2 = $13.
So the answer is 13.

[Question]: An amusement park sells tickets for $3. This week it welcomed 100 people per day but on Saturday it was visited by 200 people and on Sunday by 300. How much money did it make overall in a week?
[Answer]: During the weekdays it was visited by 100 * 5 = 500 people. On Sunday and Saturday, it was visited by 200 + 300 = 500 people. In total 500 + 500 = 1000 people visited the park in a week. So it earned 1000 * 3 = 3000 dollars in a week.
So the answer is 3000.

[Question]: Yesterday, David and William were invited to a party. David broke 2 glasses, while his friend William broke 4 times the number of glasses David broke. How many glasses were broken?
[Answer]:
William broke 4 * 2 = 8 glasses. So, David and William broke 8 + 2 = 10 glasses.
So the answer is 10.