SOLUTION: A postal clerk sold 70 stamps for $17.00.Some were 35 cent stamps and some were 20 cent.How many of each stamps did he sell?
Algebra.Com
Question 35297: A postal clerk sold 70 stamps for $17.00.Some were 35 cent stamps and some were 20 cent.How many of each stamps did he sell?
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
X+Y=70 & 35X+20Y=1700 THUS X=70-Y SUBSTITUTING (70-Y) FOR X IN THE SECOND EQUATION WE GET 35(70-Y)=20Y=1700 OR 2450-35Y+20Y=1700 OR -15Y=-750 OR
Y=750/15 OR Y=50 THEREFORE X=70-50 OR X=20
PROOF 35*20+20*50=1700 OR 700+1000=1700
RELATED QUESTIONS
a postal clerk sold 75 stamps for $4.80. some were 5-cent and some were 8-cent stamps.... (answered by Paul)
a postal clerk sold 75 stamps for $4.80. Some were 5-cent and some were 8-cent stamps.... (answered by richwmiller)
A postal clerk sold 75 stamps for $19.95. Some were 20-cent and some were 33-cent. How... (answered by Paul,stanbon!)
A postal clerk sold 40 stamps for $5.40. Some were 10-cent stamps and some were 15-cent... (answered by ikleyn,amalm06)
A postal clerk sold 75 stamps for a total of $10.85. Some of the stamps were 15-cent... (answered by stanbon)
A postal clerk sold some 13 cent stamps and some 20 cent stamps. Altogether, 60 stamps... (answered by checkley77,jojo14344)
A postal-clerk sold some 20-cent stamps and some 28-cent stamps. Altogether 160 stamps... (answered by ewatrrr)
PlEASE help! A postal clerk sold some fifteen-cent stamps and some twenty-five cent... (answered by Paul)
A postal clerk sold 50 postage stamps for $16.05. Some were 39-cent stamps and the rest... (answered by Alan3354)