A contractor undertakes to construct a bridge in 40 days and employs 2

1.	A contractor undertakes to construct a bridge in 40 days and employs 20 men. After 25 days, only 1/3 of bridge is made. How many extra men needs to be employed by contractor if he wants the work to be completed 5 days earlier.1. 100 men2. 50 men3. 20 men4. 80 men
Answer» Correct Answer - Option 4 : 80 men Given: A bridge has to be constructed in 40 days by 25 men. After 25 days, 1/3 of the bridge is made. 2/3 of the bridge needs to be constructed in 10 (15 - 5) days. Concepts used: M1 × (D1/W₁) = M2 × (D2/W₂) Where, M = Number of men, D = Number of days, H = Number of hours, W = Work Calculation: ⇒ 20 × 25/(1/3) = M × 10/(2/3) ⇒ 500 × 3 = M × 10 × (3/2) ⇒ M = 100 Extra men to be employed = 100 men – 20 men ⇒ 80 men ∴ 80 extra men have to employed for the remaining bridge to be constructed 5 days earlier.

A contractor undertakes to construct a bridge in 40 days and employs 20 men. After 25 days, only 1/3 of bridge is made. How many extra men needs to be employed by contractor if he wants the work to be completed 5 days earlier.1. 100 men2. 50 men3. 20 men4. 80 men

Answer» Correct Answer - Option 4 : 80 men

Given:

A bridge has to be constructed in 40 days by 25 men.

After 25 days, 1/3 of the bridge is made.

2/3 of the bridge needs to be constructed in 10 (15 - 5) days.

Concepts used:

M1 × (D1/W₁) = M2 × (D2/W₂)

Where, M = Number of men, D = Number of days, H = Number of hours, W = Work

Calculation:

⇒ 20 × 25/(1/3) = M × 10/(2/3)

⇒ 500 × 3 = M × 10 × (3/2)

⇒ M = 100

Extra men to be employed = 100 men – 20 men

⇒ 80 men

∴ 80 extra men have to employed for the remaining bridge to be constructed 5 days earlier.

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