John purchased some shirts and trousers for $1300. He paid $500 less for the shirts than he did for the trousers. If he bought 5 shirts and the cost of a shirt is $20 less than that of a trouser, how many trousers did he buy?	Options:
A) 4
B) 5
C) 6
D) 7
E) 9
Given that the total purchase of two items cost 1300   So the average purchase of one item will cost  1300/2= 
<gadget id="calculator"> 1300/2</gadget>
<output>650</output>
650.   Its given as total shirt cost 500$ less. Hence Total Shirt cost= 650 - 250 and Total trouser cost = 650 + 250   5 shirts = 400$ ==&gt; One shirt = 80$   One trouser = 80 + 20= 
<gadget id="calculator">80 + 20</gadget>
<output>100</output>
100$   Total trousers=900 / 100= 
<gadget id="calculator">900 / 100</gadget>
<output>9</output>
9.   9
<result>E</result>
John purchased some shirts and trousers for $1300. He paid $500 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?