Question

A boy and a girl can complete a job in 30 and 50 days respectively. In how many days 3 boys and 5 girls working together can complete the job?​

Answer 1

Answer:

10

Step-by-step explanation:

3 boys and 5girls can complete the job in 10days

Answer 2

Answer:
If 30 days and 50 days are taken by a boy and a girl respectively to complete a work, then 3 boys and 5 girls can complete the same work in 5 days

Step-by-step explanation :

Let us take W as the total work

Given

Number of days in which a boy can complete W work = 30 days

So, number of days in which 3 boys can complete W work = 30/3 = 10 days

So amount of work done by 3 boys in 1 day = W/10

Also given,

Number of days in which a girl can complete W work = 50 days

So, number of days in which 5 girls can complete W work = 50/5 = 10 days

So amount of work done by 5 girls in 1 day = W/10

So total amount of work done by 3 boys and 5 girls together in a day = W/10 +W/10 = 2W/10 = W /5

That is, 1/5 of total work

So , number of days required by 3 boys and 5 girls together to complete W work = 5 days