John purchased some shirts and trousers for $800. He paid $400 less for the shirts than he did for the trousers. If he bought 5 shirts and the cost of a shirt is $20 less than that of a trouser, how many trousers did he buy?
Pick one:
A) 4  B) 5  C) 6  D) 7  E) 10
Given that the total purchase of two items cost 800.   So the average purchase of one item will cost  800/2= 
<gadget id="calculator"> 800/2</gadget>
<output>400</output>
400.   Its given as total shirt cost 400$ less. Hence Total Shirt cost= 400 - 200 and Total trouser cost = 400 + 200   5 shirts = 200$ ==&gt; One shirt = 40$   One trouser = 40 + 20= 
<gadget id="calculator">40 + 20</gadget>
<output>60</output>
60$   Total trousers= 600 / 60= 
<gadget id="calculator">600 / 60</gadget>
<output>10</output>
10.   10
<result>E</result>
John purchased some shirts and trousers for $800. He paid $400 less for the shirts than he did for the trousers. If he bought 5 shirts and the cost of a shirt is $20 less than that of a trouser, how many trousers did he buy?