Art of Problem Solving
AoPS Online
Math texts, online classes, and more
for students in grades 5-12.
Visit AoPS Online ‚
Books for Grades 5-12 Online Courses
Beast Academy
Engaging math books and online learning
for students ages 6-13.
Visit Beast Academy ‚
Books for Ages 6-13 Beast Academy Online
AoPS Academy
Small live classes for advanced math
and language arts learners in grades 2-12.
Visit AoPS Academy ‚
Find a Physical Campus Visit the Virtual Campus
GET READY FOR THE AMC 12 WITH AoPS
Learn with outstanding instructors and top-scoring students from around the world in our AMC 12 Problem Series online course.
CHECK SCHEDULE

Difference between revisions of "2018 AMC 12A Problems"

(→‎Problem 1)
(→‎Problem 1)
Line 7: Line 7:
  
 
[[2018 AMC 12A  Problems/Problem 1|Solution]]
 
[[2018 AMC 12A  Problems/Problem 1|Solution]]
 +
 +
==Problem 2==
 +
 +
[[2018 AMC 12A  Problems/Problem 2|Solution]]
 +
==Problem 3==
 +
 +
[[2018 AMC 12A  Problems/Problem 3|Solution]]
 +
==Problem 4==
 +
 +
[[2018 AMC 12A  Problems/Problem 4|Solution]]
 +
==Problem 5==
 +
 +
[[2018 AMC 12A  Problems/Problem 5|Solution]]
 +
==Problem 6==
 +
 +
[[2018 AMC 12A  Problems/Problem 6|Solution]]
 +
==Problem 7==
 +
 +
[[2018 AMC 12A  Problems/Problem 17|Solution]]
 +
==Problem 8==
 +
 +
[[2018 AMC 12A  Problems/Problem 8|Solution]]
 +
==Problem 9==
 +
 +
[[2018 AMC 12A  Problems/Problem 9|Solution]]
 +
==Problem 10==
 +
 +
[[2018 AMC 12A  Problems/Problem 10|Solution]]
 +
==Problem 11==
 +
 +
[[2018 AMC 12A  Problems/Problem 11|Solution]]
 +
==Problem 12==
 +
 +
[[2018 AMC 12A  Problems/Problem 12|Solution]]
 +
==Problem 13==
 +
 +
[[2018 AMC 12A  Problems/Problem 13|Solution]]
 +
==Problem 14==
 +
 +
[[2018 AMC 12A  Problems/Problem 14|Solution]]
 +
==Problem 15==
 +
 +
[[2018 AMC 12A  Problems/Problem 15|Solution]]
 +
==Problem 16==
 +
 +
[[2018 AMC 12A  Problems/Problem 16|Solution]]
 +
==Problem 17==
 +
[[2018 AMC 12A  Problems/Problem 17|Solution]]
 +
 +
==Problem 18==
 +
 +
[[2018 AMC 12A  Problems/Problem 18|Solution]]
 +
==Problem 19==
 +
 +
[[2018 AMC 12A  Problems/Problem 19|Solution]]
 +
==Problem 20==
 +
 +
[[2018 AMC 12A  Problems/Problem 20|Solution]]
 +
==Problem 21==
 +
 +
[[2018 AMC 12A  Problems/Problem 21|Solution]]
 +
==Problem 22==
 +
 +
[[2018 AMC 12A  Problems/Problem 22|Solution]]
 +
==Problem 23==
 +
 +
[[2018 AMC 12A  Problems/Problem 23|Solution]]
 +
==Problem 24==
 +
 +
[[2018 AMC 12A  Problems/Problem 24|Solution]]
 +
==Problem 25==
 +
 +
[[2018 AMC 12A  Problems/Problem 25|Solution]]

Revision as of 22:55, 8 February 2018

Problem 1

A large urn contains $100$ balls, of which $36 \%$ are red and the rest are blue. How many of the blue balls must be removed so that the percentage of red balls in the urn will be $72 \%$? (No red balls are to be removed.)

$\textbf{(A)}\ 28 \qquad\textbf{(B)}\ 32 \qquad\textbf{(C)}\ 36 \qquad\textbf{(D)}\ 50 \qquad\textbf{(E)}\ 64$

Solution

Problem 2

Solution

Problem 3

Solution

Problem 4

Solution

Problem 5

Solution

Problem 6

Solution

Problem 7

Solution

Problem 8

Solution

Problem 9

Solution

Problem 10

Solution

Problem 11

Solution

Problem 12

Solution

Problem 13

Solution

Problem 14

Solution

Problem 15

Solution

Problem 16

Solution

Problem 17

Solution

Problem 18

Solution

Problem 19

Solution

Problem 20

Solution

Problem 21

Solution

Problem 22

Solution

Problem 23

Solution

Problem 24

Solution

Problem 25

Solution

Retrieved from "https://artofproblemsolving.com/wiki/index.php?title=2018_AMC_12A_Problems&oldid=90746"