A lemonade stand sold only small and large cups of lemonade on Tuesday. 3/5 of the cups sold were small and the rest were large. If the large cups were sold for 7/24 as much as the small cups, what fraction of Tuesday's total revenue was from the sale of large cups?	Choose the correct answer:
A) (a) 7/16  B) (b) 7/15  C) (c) 10/21  D) (d) 17/35  E) (e) 7/43
This problem is very good example how easy and quick plug-in method might be.   Let the total # of cups be 10.   # of small cups sold 3/5*10= 
<gadget id="calculator">3/5*10</gadget>
<output>6</output>
6;   # of large cups sold  10-6= 
<gadget id="calculator"> 10-6</gadget>
<output>4</output>
4;   Let the price of small cup be $6, then the price of larges cup would be 7/24*6=$7/4;   Revenue from small cups: 6*$6=$36;   Revenue from large cups cups: 4*$7/4  6* 6= 
<gadget id="calculator">  6* 6</gadget>
<output>36</output>
$36;   Revenue from large cups cups: 4*$7/4=$7;   Fraction of total revenue from large cups: 7/(36+7) 4* 7/4= 
<gadget id="calculator"> 4* 7/4</gadget>
<output>7</output>
$7;   Fraction of total revenue from large cups: 7/(36+7)=7/43.   Answer:(e) 7/43.
<result>E</result>
A lemonade stand sold only small and large cups of lemonade on Tuesday. 3/5 of the cups sold were small and the rest were large. If the large cups were sold for 7/24 as much as the small cups, what fraction of Tuesday's total revenue was from the sale of large cups?