0
A mixture of 650 nails costs $43.50. If some of the nails cost 5 cents a piece, and therest costs 7 cents a piece, how many of each are there?
So the total number of nails is 650, therefore:
- X + Y = 650, and 5X + 7Y = 4350
First we can solve the first equation for Y:
- Y = 650-X
Now that we know the relationship between X and Y, we can solve for one of them by substituting that value into the other equation. :
- 5X + 7Y = 4350
- 5X + 7(650-X) = 4350
- 5X + 4550 - 7X = 4350
- -2X + 4550 = 4350
- -2X=-200
- X=100
Since Y = 650-X, Y = 550.
If we plug those numbers into our original equations then we can verify the solution:
7(550) + 5(100) = 4350.
(550) + (100) = 650
Still curious? Ask our experts.
Chat with our AI personalities
Rene
Fran
BlakeAdd your answer:
Earn +20 pts
If a customer buys 24kg of nails at 16 cents per kg how much is the total purchase?
24 x 16 = 384
How can you use physical properties to separate a mixture of ice cubes and nails?
The shape, the density, the molecular structure, etc. Physical is just the appearance and what it is made up of, so it's easy.
Why should be done from the corners to the center of the nails?
nails
How many nails in a pound?
That would depend on the type (common, roofing, concrete) and their size as measured like a two penny (2d) nail and so on. For example 60d common nails are 10 to the pound and 2d roofing nails are 225 to the pound.
How can you stop a monster from biting his nails?
Other answers:Joke: How can you stop a monster from biting his nails?Punchline: Buy him a bag of screws.Joke: How can you stop a monster from biting his nails?Punchline: Send him to a Monster Reform School.
