Question

please solve this problem with Explaination​

Answer 1

Answer:

let , A & B together take x days

A will take (x+9) days

B will take (x+4) days

then,

1/(x+9) + 1/(x+4) = 1/x

or, (2x+13)/(x²+13x+36) = 1/x

or, x(2x+13) = (x²+13x+36)

or, 2x²+13x = x²+13x +36

or, x²= 36

or, x= 6 ( no of days are always positive so we neglect -6)

the answer is 6

Answer 2

Answer:

I don't understand sorry

YOU ALSO SAID THIS FOR OTHERS QUESTIONS

SO I AM ALSO SAID YOU THE SAME

If you know the answer then answer questions

whenever you don't know the answer don't answer