Question

A and B together do a job in 15 days and A alone could do the same job in 20 days. How many days would B take to do half the job if he worked alone?

A) 60 B) 30 C) 45 D) 40

Answer 1

Step-by-step explanation:

• A+B=1/15
• A=1/20
• B=1/15 - 1/20
• B=(4-3)/60
• B=1/60
• B can complete total work alone in 60 days
• B can complete half the job= 60/2=30 days

Answers is B)30

Answer 2

Answer:

answer is B

A+B = 1/15

A=1/20

B=1/15-1/20

B= 4-3/60

B= 1/60

B= 60/2. half of the work

B= 30

B will do alone half of the work in 30 days

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