Question 25801
Let x=pencils that cost .15
so; x+7=pencils that cost .35
.15x+.35(x+7)=3.45
.15x+.35x+2.45=3.45
.50x+2.45=3.45
.50x=1
x=2
So there were 2 pencils at .15;
and there were 9 pencils at .35.
Hope you understand
=)