Let x = # of the 20-dollar bills Philip has.


Then the number of 50-dollar bills is 2x, and the number of the 100-dollar bills is 2*(2x) = 4x.


Then the total money is  20x + 50*(2x) + 100*(4x) = (20+100+400)x = 520x dollars,

and it is equal to 1560 dollars, according to the condition.


    520x = 1560

   
Hence, x = 1560/520 = 3.


Thus, there are 3 20-dollar bills,  6 50-dollar bills and 12 100-dollar bills.


In all, there are 3+6+12 = 21 bills.      ANSWER.  

Let the number of $20 bills be T

Then the number of $50 bills = 2T

Also, the number of $100 bills = 2(2T) = 4T

We then get: 20T + 50(2T) + 100(4T) = 1,560

20T + 100T + 400T = 1,560

520T = 1,560

T, or 

      

You should now be able to find the total number of bills! 

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