If the number of red pens sold by shopkeeper ‘F’ is 20% less than the average number of red pens sold by shopkeeper A and B, then find the number of red pens sold by shopkeeper F.
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. Average number of red pens sold by shopkeeper A and B = (200 + 150)/2 = 175 Number of red pens sold by shopkeeper F = 175 × (80/100) = 140
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