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Devika completed the school project in 20 days. How many days will Aarav take to complete the same work if he is 25% more efficient than Devika?
1. 16 days
2. 12 days
3. 14 days
4. 18 days

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Correct Answer - Option 1 : 16 days

Given:

Devika completed the school project in = 20 days

Aarav is 25% more efficient than Devika.

Calculation:

Let the days taken by Aarav to complete the work be x

The ratio of time taken by Aarav and Devika = 125 : 100

⇒ 5 : 4

∴ 5 : 4 :: 20 : x

⇒ x = (4 × 20)/5

⇒ x = 16

∴ Aarav takes 16 days. 

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