Question

5. Malini can do a piece of work in 20 days, whereas
Shalini can do it in 25 days. Shalini started the work
and after 5 days, Malini joined her. They together
completed the remaining work. How many days
did they take to complete the whole work?
1
(a) 8
(b) 8
8.
(c) 8
8
(d) 13
9
9​

Answer 1

Answer:

Options are incorrect but answer in approx is 13 days

Let total work is 100

Efficiency of Malini = 100/20

= 5 Work/ day

Efficiency of Shalini = 100/25

= 4 Work/ day

Shalini start work and did for 5 days

Work done in 5 days = 4 X 5

= 20 work

Work left = 100-20 = 80 work

Now, they start doing work together

So,

80/9

So, Now total days

4 + 80/9

$\frac{36 + 80}{9}$

116/9 days or

$12 \times \frac{8}{9}$

or 13 days (approx)

HOPE IT HELPS

Answer 2

Answer:

sorry I don't ok

thanks you......