Problema Solution
A bank teller has 54 $5 and $20 bills in her cash drawer. The value of the
bills is $780. How many $5 bills are there?
Answer provided by our tutors
Let 5$ bills be x
$20 bills be y
x+y=54 equation 1
5x+20y=780 equation 2
Put x=54-y in equation 2
5(54-y)+20y=780
270-5y+20y=780
15y=510
y=34
x=54-34 = 20 ANS