How many of each kind of stamp does he have?

Question

Mr. Akita has 42 21 cent and 32 cent stamps all told. The stamps are worth $11.90. How many of each kind of stamp does he have?

Answer 1

x + y = 42

21x + 32y = 1190

21x + 21y = 21(42) = 882

11y = 1190-882 = 308

y = 28 32 cent stamps

x = 42-28 = 14 21 cent stamps

14(21) + 28(32) = 294 + 896 =1190