Question

At school athletic events you can buy 3 drinks and 2 hot dogs for $4.80 or you can buy 1 drink and 1 hot dog for $2.00. How much does 1 hot dog cost? A $0.80

Answer 1

$1.20

Explanation:

The first combination tells you ...

3d + 2h = 4.80

The second combination tells you ...

1d + 1h = 2.00

Subtracting twice the second equation from the first gives you the price of a drink:

(3d +2h) -2(1d +1h) = 4.80 -2(2.00)

d = 0.80 . . . . . . the price of a drink

The second equation tells you ...

h = 2.00 - d

h = 2.00 -0.80

h = 1.20

The cost of 1 hot dog is $1.20.