Question

4 boys and 6 girls can do work for 8 days similarly 3 boys and 7 girls can complete in 10 days if 8 girls do the same work how long it would take in days.

Answer 1

approximately it will take 13 days for 8 girls

Answer 2

8*(4b+6g)=10*(3b+7g)
32b-30b=70g-48g
2b=22g 
1b=11g
then 1 boy eual to 11 girls

so first quation (4b+6g)  is 8 days
      (4x11 ) +6g
50 girls for 8 days


simillary (3b+7g)   is 10 days
        (3x11)+7g
40 girls for 10 days