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 Math Problem for TJ/SHSAT/AOS/Blair Test Prep (Medium). Target Time. 25-45 seconds.

Two students, Mona and Sabrina, volunteered to paint their school classroom. The four walls add up to 77'. Mona's paint roller has diameter of 7" and Sabrina's paint roller has a diameter of 11" To make one one full round across the 77' feet of the wall, Sabrina's paint roller will make how many fewer revolutions than Mona's paint roller? Assume that the wheels do not slip or slide and assume Pi = 22/7.