Problema Solution
The price of an mp3 player is $120 more than three memory sticks. Sherry paid $864 for one mp3 player and three memory sticks. what was the cost of each?
Answer provided by our tutors
x the price of memory sticks
y the price of mp3 player
we have y=3*x+120 because "The price of an mp3 player is $120 more than three memory sticks"
y+3*x=864
But y=3*x+120, so we get 3*x+120+3*x=864
or 6*x=744
x=124 price of stick
y=3*124+120=492 price of mp3 player