Question

A and B can build a wall in 12 and 8 days.A started building the wall and after he had been working for 4 days.he was joined by B.how much total time was taken to build the wall​

Answer 1

Answer:

A's workin 1 day = 1/12

B. ... 1 day = 1/8

A+B.....1/12+1/8=2/24+3/24

= 5/24

A's work for 4 days = 1/12x4

= 4/12 = 1/3

Remain=2/3

2/3 part by A and B

2/3x24/5=5/36

36/5=7 1/5 days

Total time=4+7 1/5=11 1/5 days