Question

13 men can do a piece of work in 20 days , all the 13 men started the work and after 10 days the number of men increased by 13 , then in how many days the remaining work will be done?

Answer 1

The given AP is 10, 7, 4, ….. (-62)

a = 10, d = 7 – 10 = -3, l = -62

Now, 11th term from the end = [ l – (n – 1) d ]

= [ -62 – (11-1)(-3) ]

= -62 + 30

= -32