Stamps 2

Dennis spent 34.15 on stamps. The number of 0.56 is ten less than four times of stamps bought for 0.41. How many of each stamp did he buy?

Final Answer:

a =  50
b =  15

Step-by-step explanation:


0.56a + 0.41b = 34.15
a = 4b-10

0.56·a + 0.41·b = 34.15
a = 4·b-10

0.56a+0.41b = 34.15
a-4b = -10

Pivot: Row 1 ↔ Row 2
a-4b = -10
0.56a+0.41b = 34.15

Row 2 - 0.56 · Row 1 → Row 2
a-4b = -10
2.65b = 39.75


b = 39.75/2.65 = 15
a = -10+4b = -10+4 · 15 = 50

a = 50
b = 15

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