Question

If 20 persons can build a wall in 28 days, then the time required by 16 persons to
build the same wall is
(1) 44 days (2) 32 days
(3) 35 days (4) 48 days

Answer 1

1 person can build wall in28×20 days

16 persons can build in 28×20/16 = 35

Answer 2

If 20 persons can build a wall in 28 days
Then 1 person can build it in = 20 × 28 days
16 persons can build it in = 20 × 28 /16 = 35
Hence 16 persons can build the wall in 35 days