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Smith and Ajit can complete a task in 12 days and...

This question belongs to Arithmetic Ability Time And Work
Time and Work
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Smith and Ajit can complete a task in 12 days and 18 days, respectively. If they work together on the task for 4 days, then the fraction of the task that will be left is:

Answer & Solution
Correct Answer: Option D
Time and Work mcq question image
(Smith + Ajit) × 4 = 4 × 5 = 20
Remaining work = 36 - 20 = 16
Then the fraction of the task that will be left is $$ = \frac{{16}}{{36}} = \frac{4}{9}$$
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