Multiple choice

A man starts a work and one more man is added from the 2nd day regularly. If the work is finished in 30 days, then find how many days would be required to complete the same work with 1 man working regularly?

  1. 4960 day

  2. 461 days

  3. 240

  4. 4960 hours

  5. Cannot be determind

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sum of triangular number = n(n + 1)(n + 2)/6