John purchased some shirts and trousers for $700. 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 $20 less than that of a trouser, how many trousers did he buy? Select.
A) 4  B) 5  C) 6  D) 7  E) 11
Given that the total purchase of two items cost 700.   So the average purchase of one item will cost  700/2= 
<gadget id="calculator"> 700/2</gadget>
<output>350</output>
350.   Its given as total shirt cost 400$ less. Hence Total Shirt cost= 350 - 50 and Total trouser cost = 350 + 50   5 shirts = 150$ ==&gt; One shirt = 30$   One trouser = 30 + 20= 
<gadget id="calculator">30 + 20</gadget>
<output>50</output>
50$   Total trousers= 550 / 50= 
<gadget id="calculator">550 / 50</gadget>
<output>11</output>
11.   11
<result>E</result>
John purchased some shirts and trousers for $700. 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?