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5 skilled workers can build a wall in 20days; 8 semi-skilled workers can build a

wall in 25 days; 10 unskilled workers can build a wall in 30days. If a team has 2

skilled, 6 semi-skilled and 5 unskilled workers, how long will it take to build the

wall?
1. 20 days
2. 18 days
3. 16 days
4. 15 days

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Correct Answer - Option 4 : 15 days

5S1 × 20 = 8 × S2 × 2S = 10 × 0 × 30 = ……..

\(\Rightarrow \left( {2 \times \frac{a}{{100}} + 6 \times \frac{a}{{200}} + 5 \times \frac{a}{{300}}} \right) \times x = a\) 

⇒ x = 15 days

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