2010 AMC 12A Problems and Solution
Problem 1
What is
?
Solution
.
Problem 2
A ferry boat shuttles tourists to an island every hour starting at 10 AM until its last
trip, which starts at 3 PM. One day the boat captain notes that on the 10 AM trip
there were 100 tourists on the ferry boat, and that on each successive trip, the
number of tourists was 1 fewer than on the previous trip. How many tourists did the
ferry take to the island that day?
Solution
It is easy to see that the ferry boat takes
trips total. The total number of people
taken to the island is
Problem 3
Rectangle
, pictured below, shares
of its area with square
.
Square
shares
of its area with rectangle
. What is
?