<PRE><B>Question 33169</B>
In word problems first try to form equations with the informations given in the question.

Let X be the number of one dollar bills and Y be the number of five dollar bills.
then,
 EQ 1.   1*X + 5*Y = 160( TOTAL AMOUNT)
 
 EQ 2 .   1 * X = 3 * 5Y
            X = 15Y

substitute X = 15Y IN EQ 1.,
        we get   15Y + 5Y = 160,
        20Y = 160

    therefore Y= 160/20 = 8

put Y = 8 in  eq 2.,we get

    X = 15 * 8 
      = 120.

the answer is, the number of one -dollar bill is 120 and the number of five -dollar bills is 8..



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