Time and work

Quantitative Aptitude ( CCS)

Title

45:30

8 of 24 completed

5 of 15 completed

38 of 100 completed

8 of 20 completed

Indian Economy - Understanding the basics of Indian economic system

If 30 men and 14 boys can reap a field in 21 days. In how many days will 20 men and 4 boys will reap it? (When 3 men do as much as work as 5 boys.)

36 days

30 days

42 days

45 days

Solution:
3 men = 5 boys
M/B = 5/3
Total work = (30 M + 14B) * 21
(30*5 + 14*3) *21
= 4032
Now: 4032/20*5+4*3= 36 days.