Question 1204278
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35/100 = 7/20 of the stamps are 10 cent stamps, so 13/20 of them are 50 cent stamps.  Given those two fractions,...<br>
Let 7x = number of 10 cent stamps
Let 13x = number of 50 cent stamps<br>
The total value of the stamps is $151.20:<br>
.10(7x)+.50(13x) = 151.20
.7x+6.5x = 151.20
7.2x = 151.20
x = 151.20/7.2 = 21<br>
ANSWER: The number of 10 cent stamps he has is 7x = 7(21) =147<br>