TJ Prep Problems

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

A Sequence Problem for TJ/AOS/Blair/HSPT Prep. (Medium). 20-55 seconds.

Updated. A paintball gun shoots balls of three colors, yellow, hot pink and green. It shoots 2 yellow balls, followed by 3 hot pink balls followed by 3 green balls. It had a supply of 1800 balls but it jammed after shooting 731st ball. What color was the 731st ball?