John purchased some shirts and trousers for $1550. He paid $250 less for the shirts than he did for the trousers. If he bought 5 shirts and the cost of a shirt is $20 less than that of a trouser, how many trousers did he buy? Choose the correct option.
A) 4  B) 5  C) 6  D) 7  E) 8
Given that the total purchase of two items cost 1550.   So the average purchase of one item will cost  1550/2= 
<gadget id="calculator"> 1550/2</gadget>
<output>775</output>
775.   Its given as total shirt cost 250$ less. Hence Total Shirt cost= 775 - 125 and Total trouser cost = 775 + 125   5 shirts =650$ ==&gt; One shirt =130$   One trouser = 130 + 20= 
<gadget id="calculator">130 + 20</gadget>
<output>150</output>
150$   Total trousers= 900 / 150= 
<gadget id="calculator">900 / 150</gadget>
<output>6</output>
6.   6
<result>C</result>
John purchased some shirts and trousers for $1550. He paid $250 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?