Three boys can do a work in 15 days where as 6 girls can do in 12days. What will be the time taken to complete the same work by a teacher if the efficiency of teacher is 20% more than that of a girls?
3 x B × 15 = 6 x W x 12 B : G= 8:5 Efficiency of a teacher will be = (120 /100) × 5 = 6 Time taken by a teacher will be = (3 × 8 × 15)/6= 60 days
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