If 4 girls takes 2(1/2) hours to complete a job, how much time is required for 3 girls to finish the job, working at the same rate of performance?
Answers
Answer:
ans =1day
Step-by-step explanation:
Time taken by 5 children to complete the job =
5
20
days =4 days
∴ Time taken by 4 men to complete the job =(4×2) days =8 days
Time taken by 4 women to the complete the job =(8×2) days =16 days
Therefore, 5 children's 1 day's work =
4
1
4 men's 1 day's work =
8
1
4 women's 1 day's work =
16
1
∴ (12 men's + 10 children's + 8 women's )
1 day's work =3× (4 men's 1 day's work) +2× (5 children's 1 day's work) +2× (4 women's 1 day's work)
=3×
8
1
+2×
4
1
+2×
16
1
=
8
3
+
2
1
+
8
1
=
8
8
=1
∴ Required time =1 day.
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Answer:
3 hr 20 mins
Step-by-step explanation:
4 girls took 2(1/2) hours to complete a job.
Since man power is inversely proportional to time. (we multiply manpower and time to get 1 person work)
( consider in real life incidents, group of 4 man can do a work quicker than 1 man)
4 girls took = 2(1/2) = 2.5 hr
1 girl took = 2.5 * 4 = 10 hr
3 girls took = 10/3 = 3 1/3 = 3 hr 20 mins