Shruti purchased several number of three articles P, Q and R in the proportion 3 : 2 : 3. If the unit costs of the articles P, Q and R are 200, Rs. 90 and Rs. 60 respectively, how many articles of Q must have been purchased in the total purchases of Rs. 4800?	Choose the correct choice from the following choices
A) 8
B) 10
C) 12
D) 14
E) 16
Explanation:   Let the number of articles of types P, Q and R be 3a, 2a and 3a respectively.   Thus, we get,   (200 x 3a) + (90 x 2a) + (60 x 3a) = 4800   960a = 4800   a = 5   Hence, the number of articles of type “Q” = 2x5 = 10   ANSWER 10
<result>B</result>
Shruti purchased several number of three articles P, Q and R in the proportion 3 : 2 : 3. If the unit costs of the articles P, Q and R are 200, Rs. 90 and Rs. 60 respectively, how many articles of Q must have been purchased in the total purchases of Rs. 4800?