SOLUTION: mary has 36 bill in her piers, 10 bills and 20 bills in total 460 dollars, how many 10 and 20 bills are in her piers

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Question 165715: mary has 36 bill in her piers, 10 bills and 20 bills in total 460 dollars,
how many 10 and 20 bills are in her piers
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
x+y=36
x=36-y
10x+20y=460
10(36-y)+20y=460
360-10y+20y=460
10y=460-360
10y=100
y=100/10
y=10 twenty dollar bills.
x+10=36
x=36-10
x=26 10 dollar bills.
Proof:
10*26+20*10=460
260+200=460
460=460