1. Elango sets up and burns a single CD in 3.5 minutes. If 70 minutes had been consumed, how many CDs would Elango have burnt?
SOLUTION
Answer: 20
Explanation: It took 3.5 minutes to burn 1 CD. Hence if 70 minutes had been consumed then the number of CDs that were burnt would be
(70 x 1)/3.5 = (70 x 2)/7 = 20.