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robert bought 8 dollars worth of 6 cent stamps and 8 cent stamps. He has a total of 110 stamps. Find how many of each stamp he has.

Guest Apr 29, 2015

Best Answer 

 #4
avatar+11752 
+5

absulutely...you know my brain takes a bit time to take such things in and verify them..........its kinda tubeligh !LOL......

 

anyways thank you!

 

how about a gift!

 

actually today or tonight im happy....ive got my lost favorite comb!so a gift for you!

rosala  Apr 29, 2015
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5+0 Answers

 #1
avatar+78551 
+5

Let x be the number of 6 cent stamps. Then 110 - x equals the number of 8 cent stamps. So we have... (in cents).....

6x +  8(110 - x)  = 800     simplify

6x + 880 - 8x  = 800

-2x + 880  = 800     subtract 880 from both sides

-2x = - 80                 divide both sides by -2

x = 40     and that's the nimber of 6 cent stamps

And (110 - 40)  =70    and that's the number of 8 cent stamps

 

  

CPhill  Apr 29, 2015
 #2
avatar+11752 
+5

Cphill thats an excellent answer (obviously...as always)...but as usual the problem is i dont get this step...i mena cna you tell me why you did it like this....explain....

 

6x +  8(110 - x)  = 800     simplify

 

rosala  Apr 29, 2015
 #3
avatar+78551 
+5

Rosala.....

Notice that the cost of each stamp type times the number of them can be written as :

6 cents x the number of 6 cent stamps  + 8 cents x the number of 8 cent stamps =  the total cost (8.00 or 800 cents) 

Or simply

6x + 8(110 - x)  = 800    [I'm expressing everything in terms of cents in this equation ]

Does that make sense  ????

 

 

  

CPhill  Apr 29, 2015
 #4
avatar+11752 
+5
Best Answer

absulutely...you know my brain takes a bit time to take such things in and verify them..........its kinda tubeligh !LOL......

 

anyways thank you!

 

how about a gift!

 

actually today or tonight im happy....ive got my lost favorite comb!so a gift for you!

rosala  Apr 29, 2015
 #5
avatar+78551 
0

Thanks, rosala....those dates look good  !!!!

 

 

  

CPhill  Apr 29, 2015

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