SOLUTION: Today you buy 10 plain donuts and 5 chocolate glazed donuts for $3.70. Last week you went to the same store and bought 5 plain donuts and 10 chocolate glazed donuts for $4.10.

Algebra ->  Decimal-numbers -> SOLUTION: Today you buy 10 plain donuts and 5 chocolate glazed donuts for $3.70. Last week you went to the same store and bought 5 plain donuts and 10 chocolate glazed donuts for $4.10.       Log On


   

Question 301374: Today you buy 10 plain donuts and 5
chocolate glazed donuts for $3.70. Last
week you went to the same store and
bought 5 plain donuts and 10 chocolate
glazed donuts for $4.10. How much are
each kind of donut?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
10p%2B5c=3.70multiply by a -2
5p%2B10c=4.10
_________________
-20p-10c=-7.40
5p%2B10c=4.10 add together
-15p=-3.30 divide by -15
p=.22
5p%2B10c=4.10
5%28.22%29%2B10c=4.10
1.10%2B10c=4.10
10c=3.00
c=.30
plain are 22 cents
chocolate are 30 cents