SOLUTION: At fundraising event for a local kindergarten school, a total of $400 have been collected in three different types of denominations: $5 s, $10 bills and $20 bills. There were four

Question 1056129: At fundraising event for a local kindergarten school, a total of $400 have been collected in three different types of denominations: $5 s, $10 bills and $20 bills. There were four more $10 bills than $20 bills, and there were twice as many $5 bills as $20 bills. Find the number of $5 bills , the number of $10 bills and the number of $20 bills
Answer by ikleyn(52790) (Show Source): You can put this solution on YOUR website!
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At fundraising event for a local kindergarten school, a total of $400 have been collected in three different types of denominations:
$5 s, $10 bills and $20 bills. There were four more $10 bills than $20 bills, and there were twice as many $5 bills as $20 bills.
Find the number of $5 bills , the number of $10 bills and the number of $20 bills
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

x for $20 bills.

Then the number of the $10 bills is (x+4),
and  the number of the $5  bills is  2x.

 $5 dollar bills contribute 5*(2x)   to the total.
$10 dollar bills contribute 10*(x+4) to the total.
$10 dollar bills contribute 20*x     to the total.

The equation for the total is

5*(2x) + 10*(x+4) + 20x = 400,   or

10x + 10x + 40 + 20x = 400,   or

40x = 400-40 = 360,

x =  = 9.

Answer. There were 9 $20-dollar bills,  9+4 = 13 $10-dollar bills, and 18 $5-dollar bills.

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