Question

if a can do 1/6 of a certain work in 4 days and B can do 2/3 of the work in 12 days, then how long will A and B take to complete the work together ​

Answer 1

First find how much work A and B can do power day.

A can do 1/3/5 =1/15 of the work per day

B can do 2/5/10=2/50=1/25 of the work per day.

A and B can do (1/15)+(1/25) work per day.

= 8/75 of the per day

Days needed for then to complete the work = 75/8 (as 8/75 and 75/8 multiplied will get 1, that is, the whole task)

Number of days needed= 75/8 = 9.375 days ≈ 10 days. (As the number of days should be a whole number)

Answer 2

Answer:

in 10 days because I find answer in the notebook