A bank teller has a total of 124 bills in fives and tens. The total value of the money is $840. How many of each kind does he have?
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1 answer

first, we represent the unknowns using variables:
let x = number of 5dollar bill
since according to first statement, he has a total of 124 bills in 5 and 10,
let 124  x = number of 10dollar bill
now we set up the equation,, according to the second statement, the total value is $840. thus,
5x + 10(124x) = 840
solving for x:
5x + 1240  10x = 840
5x + 1240 = 840
5x = 400
to get x alone, we divide both sides by the numerical coefficient of x which is 5:
(5x)/(5) = 400/(5)
x = 80 fivedollar bill
124x = 44 tendollar bill
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answered by Jai
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