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Jyoti can do frac 3 4 of a job in 12...

This question belongs to Arithmetic Ability Time And Work
Time and Work
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Jyoti can do $$\frac{3}{4}$$ of a job in 12 days. Mala is twice as efficient as Jyoti. In how many days will Mala finish the job ?

Answer & Solution
Correct Answer: Option B
Jyoti does $$\frac{3}{4}$$ unit of work in 12 days
Jyoti does 1 unit of work in
$$\eqalign{ & = 12 \times \frac{4}{3} \cr & = 16{\text{ days}} \cr} $$
According to the question,
  Mala   :   Jyoti
Efficiency →   2   :   1
Time → 1 : 2
  ↓×8   ←↓×8
  8 days   16 days
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