Question

A and B together can do, a piece of work in
12 days : Band C together can do it in
15 days . If A is twice as good a workman as C
how many days A alone will do the same work​

Answer 1

Step-by-step explanation:

a&b is 2+(l+b) (-21+15

Answer 2

Answer:

A will take 30 days to complete the work alone.

Step-by-step explanation:

A and B take 12 days to do 1 work

In 1 day, A and B will do 1/12th work

B and C take 15 days to do 1 work

In 1 day, B and C will do 1/15th work

A+2B+C=1/12+1/15

But A=2C

C=A/2

A+2B+A/2=9/60

3A+4B=9/30---->(1)

A+B=1/12

4A+4B=1/3----->(2)

Subtract (1) from (2)

A=1/3-9/30

A=1/30

So in 1 day A will do 1/30th of work

Therefore it will take A 30 days to do the same work alone.

Hope it helps you!