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Friday, October 30, 2009

A bank teller was asked to cash a check for $260 with three times as many one-dollar bills as five&#

A bank teller was asked to cash a check for $260 with three times as many one-dollar bills as five%26#039;s and half as many tens as five%26#039;s. What denominations of cash should the teller have given?



A bank teller was asked to cash a check for $260 with three times as many one-dollar bills as five%26#039;s and halfcredot siosse





x = 1%26#039;s



y = 5%26#039;s



z = 10%26#039;s



x = 3y; y = x/3



y = 2z; z = y/2



x = 6z; z = x/6



x + 5y + 10z = 260



x + 5x/3 + 10x/6 = 260



x + 10x/3 = 260



3x + 10x = 780



13x = 780



x = 780/13



x = 60



60 1%26#039;s, 20 5%26#039;s, 10 10%26#039;s



Check: 60 + (20 脳 5) + (10 脳 10) = 260



A bank teller was asked to cash a check for $260 with three times as many one-dollar bills as five%26#039;s and half

loan



x = number of fives



3x= number of ones



x/2 = number of tens



Now take the number of each bills multiplied by their value to get the equation to solve.



5(x)+(3x)+10(x/2) = 260



5x+3x+5x=260



13x=260



x=20



so putting that value into the expressions listed first:



number of fives = x = 20



number of ones = 3x = 3(20) =60



number of tens = x/2 = 20/2 = 10|||x=# ones



y=# fives



z=# tens



x=3y



y=2z (change this to z=y/2)



and



x+5y+10z=260



3y+5y+10(y/2)=260



8y+5y=260



y=20



x=3y=60



z=y/2=10



so ten $10 and twenty $5 and sixty $1



100+100+60=260, so it works

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