Question 51441
Ok well first we must make a table like this... 

	     Amt.      $     Total   
Raisins	  r	  2.20	    2.20r
Nuts	  15	  4.00	    60
Total	 15+r	  3.00	    (15+r)3

Now we have to write an equation which would be 2.2r+60=(15+r)3 then we would distribute the three to get 2.2r+60=45+3r Then subtract both sides by 45 to get 2.2r+15=3r. Now subtract each side by 2.2r to get 15=.8r. Now multiply each side by 10 to get rid of the decimal thus getting 150=8r. Then divide both sides by 8 to get r=18.5. So you would need 18.5 pounds of raisins. Hope this helps!!