David removes 30% of the water in a jar. He then removes 40% of what remains in the jar. What percent of the original amount of water is now in the jar?

[A solution to this problem will appear along with next month’s problem.]



If 3/4 of a certain number is 36, what is 2/3 of that same number?

[ 32 ]



If the length of a rectangle is reduced by 3 meters and the width is increased by 2 meters, the result is a square whose area is the same as that of the rectangle. What is that area

[ 36 sq m ]

Visit our MOEMS Classic page Problem of the Month for detailed solutions

Copyright © 2017by Mathematical Olympiads for Elementary and Middle Schools, Inc. All rights reserved.


For many additional problems we highly recommend the following books:

Math Olympiad Contest Problems for Elementary and Middle Schools by Dr. G. Lenchner
Math Olympiad Contest Problems Volume 2 edited by Richard Kalman
MOEMS® Contest Problems Volume 3
edited by Richard Kalman & Nicholas J. Restivo.
are sources of many such problems.

Creative Problem Solving in School Mathematics 2nd Edition by Dr. George Lenchner
can help you to teach solving these types of problems