A. 50 days

B. 60 days

C. 70 days

**D. 80 days**

A. 50 days

B. 60 days

C. 70 days

**D. 80 days**

A. 16 days

B. 18 days

C. 20 days

**D. 25 days**

A. 2 days

B. 3 days

C. 5 days

**D. 6 days**

A. 4 days

**B. 6 days**

C. 8 days

D. 10 days

**A. 4 days**

B. 6 days

C. 8 days

D. 10 days

**Explanation**

If B takes 12 days to finish the work, then A takes 6 days to finish the same work.

If A can complete a work in x days and B can complete the same work in y days, then, both of them together can complete the work in x y/ x+ y days.

Therefore, the number of days taken by A and B together to finish the same work will be:

= 6 × 12/18= 4 days.

A. 8 days

B. 11 days

**C. 13 days**

D. 17 days

**A. 12 days**

B. 14 days

C. 16 days

D. 18 days

A. 10

B. 12

C. 14

**D. 16**

**A. 10/3 days**

B. 5 days

C. 13/2 days

D. 8 days

A. 5.5 days

B. 7.75 days

C. 9 days

**D. 10 days**

**A. 30 hours**

B. 40 hours

C. 50 hours

D. 55 hours

A. 12 days

**B. 15 days**

C. 18 days

D. 20 days

A. 10 days

B. 15 days

C. 20 days

**D. 25 days**

A. 6 days

**B. 8 days**

C. 12 days

D. 16 days

**A. 3 days**

B. 5 days

C. 6 days

D. 7 days

A. 3/4 day

**B. 1 day**

C. 1.5 days

D. 2 days

A. 6 days

**B. 8 days**

C. 10 days

D. 12 days