Answer:
32.5 days
Explanation:
9 girls & 11 boys complete the piece work in 25 days.
3 girls equal 5 boys. So 9 girls equal 15 boys
15 + 11 =26 man-power complete in 25 days. So man days 26×25= 650
6girl &10 boys complete work
Now manpower
6 girls are equivalent to 10 boys, and with that 10 boys converted from the 6 girls+10 boys = 20 manpower
Man days 650 So no. Of days 650/20=32.5 Days.
we get 650 from the manpower x number of days. both equations must add up to 650. Therefore, it takes 6 girls and 10 boys 32.5 days