How many of each kind of stamps does he have?

Question

Mr. Akika has 30 24-cent and 33-cent stamps all told. The stamps are worth $8.91. How many of each kind of stamp does he have?

Answer 1

x + y = 30

24x + 33y = 891

24x + 24y = 24(30) = 720

9y = 171

y = 19 33 cent stamps

x= 11 24 cent stamps

24(11) + 19(33) = 264 + 627 = 891