If it takes 2 programmers 2 days to write
2 programs, how many programmers are
needed to write 20 programs in 20 days?

Question

If it takes 2 programmers 2 days to write
2 programs, how many programmers are
needed to write 20 programs in 20 days?

anonymous · Answer

2 programs are written in 2 days   by  =  2 programmers
2 programs will be written in 1 day  by  = 2*2 = 4 programmers
1 program will be written in 1 day by = 4/2 = 2 programmers
20 programs will be written in 1 day by  =  2*20 = 40 programmers
20 programs will be written in 20 days by  =  40/20 = 2 programmers

answer  2 programmers.

directrix · Answer

Anybody else have a solution. If so, post.

anonymous · Answer

@geniusy_2006 , looks good... i agree.

ash2326 · Answer

Yeah it's correct, good  illustration @geniusy_2006

hoblos · Answer

it is a great explanation @geniusy_2006 but you can think in an easier way though

simply 
2 programmers write 2 programs in 2 days
                       so in 20 days they write [ 20*2/2 ] = 20 programs

you get the answer is two