Answer: the Murphys spent $700 on tickets.
Step-by-step explanation:
Let x represent the cost of one ticket to a game.
The Murphy family has 4 members and goes to 7 games. This means that the number of tickets that the Murphy's family bought is
4 × 7 = 28 tickets
The cost of 28 tickets would be
28 × x = $28x
The Chen family has 5 members and goes to 4 games. This means that the number of tickets that the Chen's family bought is
5 × 4 = 20 tickets
The cost of 20 tickets would be
20 × x = $20x
If the two families spend a total of $1200, it means that
28x + 20x = 1200
48x = 1200
x = 1200/48 = 25
A ticket costs $25
The total amount that the Murphys spend on tickets is
28 × 25 = $700
