Question : Shivam is 20 percent less efficient than Vivek. If Vivek can make a helmet in 12 days, then in how many days can Shivam make the same helmet?
Option 1: 12 days
Option 2: 18 days
Option 3: 15 days
Option 4: 14 days
Correct Answer: 15 days
Solution :
Given: Shivam is 20 percent less efficient than Vivek.
Vivek can make a helmet in 12 days.
Work done = Time × Efficiency
Per day work of Vivek to make the helmet = $\frac{1}{12}$
Per day work of Shivam to make the helmet = $\frac{100–20}{100}\times\frac{1}{12}=\frac{80}{100}\times\frac{1}{12}=\frac{1}{15}$
So, Shivam will take 15 days to make the helmet.
Hence, the correct answer is 15 days.
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