math question .

Question

The class is selling food at the school fair. Pretzels cost $1.50, and bottles of water cost 1.00 . The class sold a total of 107 items and collected $128. How many pretzels did the class sell?

Answer 1

p + w = 107

1.5p + w = 128 (remember that we don't say "1w")

w = 107 - p

w = 128 - 1.5p

107 - p = 128 - 1.5p

0.5p = 21

p = 42 pretzels