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Chapter 2: Q. 171 (page 231)

Stamps Travis bought $9.45 worth of 49-cent stamps and 21-cent stamps. The number of 21-cent stamps was 5 less than the number of 49-cent stamps. Solve the equation 0.49s + 0.21(s 鈭� 5) = 9.45 for s, to find the number of 49-cent stamps Travis bought.

Short Answer

Expert verified

Thus, the number of 49-cent stamps Travis bought is 15.

Step by step solution

01

Step 1. Given information.

given equation,

0.49s+0.21(s鈭�5)=9.45

02

Step 2. Solve the equation for s,

0.49s+0.21(s鈭�5)=9.45鈬�0.49s+0.21s-1.05=9.45鈬�0.70s=10.50鈬�s=15

Thus, the number of 49-cent stamps Travis bought is 15.

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