SOLUTION: A book cost $15 if bought online and $22.50 if bought at the store. The bookstore sold 250 books and took in $4995. How many books were bought online and how many were bought in th

Question 385312: A book cost $15 if bought online and $22.50 if bought at the store. The bookstore sold 250 books and took in $4995. How many books were bought online and how many were bought in the store?
Found 2 solutions by texttutoring, mananth:
Answer by texttutoring(324) (Show Source): You can put this solution on YOUR website!
You have two variables, so you need to make two equations.

Let x = number of books bought online
Let y = number of books bought in store

There were 250 books sold in total:

x+y = 250

Their sales totaled $4995:

15x + 22.50y = 4995

Use elimination or substitution with the two equations to solve for x and y. I will use elimination, by multiplying the first equation by 15, then subtracting.

15x + 22.50y = 4995
15x + 15y = 3750
-----------------
0 + 7.50y = 1245

y = 1245/7.50
y= 166

Now find x:
x+y=250
x+166=250
x=250-166
x=84

So there were 84 books sold online, and 166 sold in the store. Hope this helps! Let me know if you need any more help.

Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
A book cost $15 if bought online and $22.50 if bought at the store. The bookstore sold 250 books and took in $4995. How many books were bought online and how many were bought in the store?
...
books DISABLED_event_online= x numbers
books from store= y
x+y=250..........1
15x+22.50y = 4995...........2
...
multiply (1) by -15
-15x-15y=-3750
add this to (2)
15x-15x+22.50y-15y= -3750+4995
7.5y=1245
/7.5
y=1245/7.5
y = 166 books from store.
Balance online. 84 books
...
m.ananth@hotmail.ca
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