When Devon cashed a $450 check at the bank, the teller gave him 18 bills, all $20 bills and $50 bills. Which system of equations
can be used to find how many of each type of bill Devon received?
1 answer:
Let, the number of $20 bill = x
number of $50 bill = y
Equations would be: x + y = 18
& 20x + 50y = 450
Substitute value of x from 1st equation into 2nd equation;
20(18-y) + 50y = 450
360-20y + 50y = 450
30y = 450-360
y = 90/30
y = 3
Now, Substitute value of y in 1st equation,
x + 3 = 18
x = 18 - 3 = 15
So, There were 15 bills of $20 and 3 bills of $50
Hope this helps!
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