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a bank teller has 54 in \$5 and \$20 bill s. the total value is \$780. how many 5 dollars are there

• math -

34

• math -

X+y=54
5x+20y=780

-5(x+y=54)

-5x-5y=-270
5x+20y=780

15y=510
Y=34
X=20

5(20)+20(34)=780
Five dollars bills = 20

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