TJ Prep Problems

TJ Prep practice problems for our students and readers. The problems provide a very small sampling of what Optimal TJ Prep students work with.

An Average Problem for TJ/AOS/SSAT/SAT Prep (Easy). Target Time. 20-40 seconds.

January 3, 2014

The average weight of five teachers is 160 lbs.What should be the average weight of 15 students be so that the average weight of the entire group (5 teachers and 15 students) is 100 lbs? Note. There are many ways to solve this problem; the most efficient way should take 15-20 seconds.