Explanation:

Correct option:3

Samir = 10 days. Puneet = 15 days,

Samir = 10 days. Puneet = 15 days,
⇒ Samir +  Puneet worked for 3 days = (3 + 2) x 5 = 15 units.    .. (Efficiency × Days = Total work)

⇒ Remaining work is completed with the help of Ashok in 5 days;

⇒ 15/(3+2+Ashok) = 2 days.               ..(Work / Efficiency = Time)

⇒ 2(Ashok) = 5

⇒ Ashok = 5/2
 = 2.5   (Efficiency)

The amount given for the work is Rs. 4500.

Share of everyone will be = (3 + 2 + 2.5)x = 4500

⇒ 7.5x = 4500

⇒ x = 600.

As, Ashok helped in doing half of the work. Therefore his share will be =  600/2 = 300

⇒ 300 x Ashok's efficiency ⇒ 300 x 2.5 = 750 

Therefore, Ashok's share will be Rs. 750.