Problema Solution
Christine went shopping and bought each of her ten nephews a gift, either a video costing $14.95 or a CD costing $16.88. She spent $161.08 on the gifts. How many videos and how many CDs did she buy?
Answer provided by our tutors
v = number of videos
c = number of CDs
v + c = 10
14.95 v + 16.88c = 161.08
=> v = 10 -c
=> 14.95(10 - c) + 16.88c = 161.08
149.50 - 14.95c + 16.88c = 161.08
149.50 + 1.93c = 161.08
1.93c = 11.58
c = 6
v + (6) = 10
v = 4
Christine bought 6 CDs and 4 videos.