There are 25 workers in a group. Each can do 1 unit/day. They stary a job of 330 units . After each day, a worker of the same efficieny as each worker in the group joins the group. The job was completed in x . Find x

Options

A. 9
B. 10
C. 1
D. 12

Answer

C

Explanation

(i) On the first day 25 unis of work is done. On the second day 26 units, third day 27 units the work id done in this way
(ii) Let `25+26+27+................` upto x terms =330
(iii) Find x.