1.

5. Malini can do a piece of work in 20 days, whereasShalini can do it in 25 days. Shalini started the workand after 5 days, Malini joined her. They togethercompleted the remaining work. How many daysdid they take to complete the whole work?1(a) 8(b) 88.(c) 88(d) 1399​

Answer»

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


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