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ATQ, Let efficiency of a boy and a girl be 'b' units/day and 'g' units/day, respectively. According to question, 20b = 35g 4b = 7g Total amount of targets = 20b × 27 = 540b units 21 boy and 42 girls = 21b + 42g = 21b + 6 × 7g = 21b + 24b = 45b Hence Desired time = (540b/45b) = 12 days
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