Given
Angie and Kenny play online video games
Angie buys 1 software package and 3 months of game play
Kenny buys 1 software package and 4 months of game play
Each software package cost $50
total cost is 240
Find out the cost of one month of gameplay.
To proof
let us assume that the cost of one month of game play = x
As given in the question
Angie buys 1 software package and 3 months of game play
Kenny buys 1 software package and 4 months of game play
Each software package cost = $50
Total cost =$240
Than the equation becomes
( 50 + 3x ) + ( 50 + 4x ) = 240
100 + 7x= 240
7x= 140
x = $20
The cost of one month gameplay is $ 240.
Hence proved