Question

A store has 125 scientific calculators.

Brand x sells for $20 each; Brand y sells
for $15 each. If the total selling price
of the calculators is $2,275, how many
of each calculator does the store have?

Answer 1

Brand x: 80

Brand y: 45

Explanation:

x + y = 125

20x + 15y = 2275

-20x - 20y = -2500

(+) 20x + 15y = 2275

--------------------------------

-5y = -225

y = 45

x + y = 125

x + 45 = 125

x = 80

Answer:

Brand x: 80

Brand y: 45