A chemistry teacher needs to mix a 20% salt solution with a 80% salt solution to make 25 qt of a 44% salt solution. How many quarts of each solution should the teacher mix to get the desired result?
20% salt solution ???? qt
80% salt solution ???? qt

Question

A chemistry teacher needs to mix a 20% salt solution with a 80% salt solution to make 25 qt of a 44% salt solution. How many quarts of each solution should the teacher mix to get the desired result? 
20% salt solution	  ????  	  qt
80% salt solution	????    	  qt

emmynimmy · Answer

A retired woman has $50,000 to invest but needs to make $6,000 a year from the interest to meet certain living expenses. One bond investment pays 15% annual interest. The rest of it she wants to put in a CD that pays 7%. 

Set up and solve the equation for how much the woman should invest in each option to sustain exactly a $6,000 annual return. 
bond	    	$  
CD		$