Time and Work Practice Test 3 with solutions

Question : 40 of 40

Marks: +1, -0

Red, Blue and Yellow alone can do a work in 7, 23 and 13 days respectively. In how many days can they finish the work together?

Solution:

Work done by all of them in one day
=

1/7 + 1/{23}+1/{13}

{299 + 91 + 161}/{2093}

{551}/{2093}

So, number of days required =

{2093}/{551}

3 {440}/{551}

days

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