Developed by Professor Shane Frederick, Massachusetts Institute of Technology

Please answer the following questions. You have a total of 90 seconds, or 30 seconds per question:

A bat and a ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?

If it takes five machines five minutes to make five widgets, how long does it take 100 machines to make 100 widgets?

In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?


ANSWERS
Correct answers are here. For more information on the CRT get this 104kb pdf.