Deanna has 5-cent stamps and 10-cent stamps. If she has 100 total stamps, what is the value of the s

[math_celebrity]

Deanna has 5-cent stamps and 10-cent stamps. If she has 100 total stamps, what is the value of the stamps? Call the 5-cent stamps n.

Value of 5-cent stamps
0.05n

Number of 10 cent stamps is:
100 - n
Value is 0.10(100 - n) = 10 - 0.10n

Add them both:
10 - 0.10n + 0.05n
10 - 0.05n