MathDB

2

Part of 2015 AMC 10

Problems(2)

Triangle and Squares

Source: 2015 AMC 10 a #2

2/4/2015
A box contains a collection of triangular and square tiles. There are 25 tiles in the box, containing 84 edges total. How many square tiles are there in the box?
<spanclass=′latex−bold′>(A)</span>3<spanclass=′latex−bold′>(B)</span>5<spanclass=′latex−bold′>(C)</span>7<spanclass=′latex−bold′>(D)</span>9<spanclass=′latex−bold′>(E)</span>11 <span class='latex-bold'>(A) </span>3 \qquad<span class='latex-bold'>(B) </span>5\qquad<span class='latex-bold'>(C) </span>7\qquad<span class='latex-bold'>(D) </span>9\qquad<span class='latex-bold'>(E) </span>\text{11}
AMC
Unclockblockable

Source: 2015 AMC 10B/12B Problem 2

2/26/2015
Marie does three equally time-consuming tasks in a row without taking breaks. She begins the first task at 1:00 PM and finishes the second task at 2:40 PM. When does she finish the third task?
<spanclass=′latex−bold′>(A)</span>3:10 PM<spanclass=′latex−bold′>(B)</span>3:30 PM<spanclass=′latex−bold′>(C)</span>4:00 PM<spanclass=′latex−bold′>(D)</span>4:10 PM<spanclass=′latex−bold′>(E)</span>4:30 PM <span class='latex-bold'>(A) </span>\text{3:10 PM}\qquad<span class='latex-bold'>(B) </span>\text{3:30 PM}\qquad<span class='latex-bold'>(C) </span>\text{4:00 PM}\qquad<span class='latex-bold'>(D) </span>\text{4:10 PM}\qquad<span class='latex-bold'>(E) </span>\text{4:30 PM}
AMC