Question

Jyoti and Sushma together can do a piece of work in 6 days and Sushma alone can do it un 9 days .In how many days can Jyoti alone complete the work ?

Answer 1

In my first thought, I would look at it like this, J + S = 6. S = 9...what is J

Answer 2

Let the total work 18k
9J=18k
For S 18k/9=2k per day S=2k
6J+6S=18k(for working 6 days)
6J+6(2k)=18k
J=k per day so
for J doing 18k alone 18k/k=18 days

Answer 3

can u explain the solution ?

Answer 4

I give the total work 18k
then i write 2 equations
1) 6j+6s=18k these 6's are the days they work together
2) 9s=18k 9 is the day s work alone
now for 2. equation s=2k
then put s=2k in first equation
that gives 6j+6(2k)=18k
6j+12k=18k
6j=6k so j=k j can work k per day
we have 18k work and k per day worker just divide them
18k/k=18days

Answer 5

but why the total work as "18k'

Answer 6

i take it for easy calculations .6 and 9 can divide 18 right if u need something like that just multiply both numbers and use it the answer will be the same like 6.9=54k

Answer 7

OHH u hv taken the Least Common Multiple.......

Answer 8

yea. just write equations for this kind of porblems

Answer 9

6J+6(2k)=18k(WHAT DO U MEAN BY THAT ?)

Answer 10

s=2k right. i put s in the equation

Answer 11

WHAT IS K ?

Answer 12

lol sorry k is just a unit that i use in math equations

Answer 13

THANKS