What is the difference between the sum of the number of red pens and the number of black pens sold by shopkeeper D and the number of black pens sold by shopkeeper A?
For shopkeeper A, Let the number of red pens sold be ‘x’. Then, the number of blue pens sold = 55% of x = 0.55x Now according to question, => x + 0.55x = 310 => x = 200 Number of red pens sold = 200 Number of blue pens sold = 0.55x = 110 Number of black pens sold = 110 × (9/11) = 90 Similarly, we can find the required data for the other shopkeeper too. 
Required difference = (160 + 150) – 90 = 220
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