Answer:
m=5
Step-by-step explanation:
c=30m+50
c=20m+100
substitute
20m+100=30m+50
like terms
100-50=30m-20m
50=10m
m=5
If we have 420 books for every 7 shelves and are looking for how many books are on 4 shelves, we need to set up fractional proportions.
We have 7 shelves for every 420 books, so we will have our first fraction like this:
7/420.
We also have 4 shelves for every x books, so our second fraction will be 4/x.
Set these fractions up as an equation.
7/420 = 4/x
To solve for x, we need to cross multiply the numerators of one fraction with the denominators of the other fraction.
In other words, multiply the top number of one fraction by the bottom number of the other question.
It should look like this:
7(x)
420(4)
7(x) = 7x
420(4) = 1680
Set your products up as an equation.
7x = 1680
Now to solve for x, we need to simplify.
Currently, x is being multiplied by 7.
To get x alone, divide 7x by 7.
Remember, what you do to one side of an equation, you must do to the other, so divide 1680 by 7.
7x / 7 = x
1680 / 7 = 240
You are left with:
x = 240.
For every 4 shelves you have 240 books.
I hope this helps!
Answer:
5.3
Step-by-step explanation:
the cost of each taxi ride the same? How much would
this trip cost?
Answer:
The cost of parking the car for 1 hour = $2.5
Step-by-step explanation:
Cost of parking car for two hours = $5
Now, let the cost of parking the car for one hour be $x
Since, the car is parked for two hours and the cost charged is $5
So, each hour the cost of parking is same ⇒ Cost of parking one hour is half the cost of parking the car for two hours.
Since, the cost of parking the car for one hour = $x
So, cost of parking the car for two hours = 2x
But this cost is given to be $5
⇒ 2x = 5
⇒ x = 2.5
Hence, The cost of parking the car for 1 hour = $2.5
