At the shopping mall, Joaquin bought 4 pretzels and a bottle of water for $11.50. Kelly bought 3 pretzels and a bottle of water for $9.00. What is the price of a bottle of water?

$1.50

Step-by-step explanation:

They each bought one bottle of water, but one of them bought one less pretz l than th other. The difference in price is $2.50, which means a pretzel is 2.50 . Four pretzels would be $10, which leaves $1.50 fo the water. 3 pretzels would be 7.50, which leaves 1.50 for the water.

$1.50

Step-by-step explanation:

Let P be the price of a pretzel

and W be the price of a bottle of water.

We are told

[1]XXX4P+1W=11.50

[2]XXX3P+1W=9.00

Subtracting [2] from [1] we get

[3]XXX1P=2.50

Substituting 2.50 for P in [1], we get

[4]XXX4×2.50+1W=11.50

or

[5]XXX1W=1.50

john earns $14.00 for two hours of work.