Dan has $75.00 in ones, fives, and tens. The number of ones is twice the number of fives. The number of tens is one less than the number of fives.How many of each kind of bills does Dan have?

x+5y+10z=75.

x=2y.

z=y-1.

2y+5y+10(y-1)=75.

17y=75+10.

y=85/17=5.

x=2y=10.

z=y-1

=5-1=4.

Number of ones =10.

Number of fives y=5.

NUmber of tens z=5.