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# A postal clerk sold 75 stamps for a total of \$10.85. Some o

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A postal clerk sold 75 stamps for a total of \$10.85. Some o [#permalink]  22 May 2020, 10:19
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A postal clerk sold 75 stamps for a total of \$10.85. Some of the stamps were IS-cent stamps and the remainder of the stamps were 13-cent stamps. How many of the stamps were 13-cent stamps?

(A) 15

(B) 20

(C) 25

(D) 30

(E) 55
[Reveal] Spoiler: OA

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Re: A postal clerk sold 75 stamps for a total of \$10.85. Some o [#permalink]  22 May 2020, 23:02
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Let 15-cent stamp be x and 13-cent stamp be y.
15x + 13y = 1085
and x + y =75
Thus, x = 75-y
Substitute value of x in first equation,
15 (75-y) + 13y = 1085
2y = 40
y = 20
Re: A postal clerk sold 75 stamps for a total of \$10.85. Some o   [#permalink] 22 May 2020, 23:02
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