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12 programmers take 12 minute to write 12 lines

so 1 programmer will take 12 minutes to write 1 line

so 1 programmer will take 1 minute to write 1/12th of a line

so 72 programmers will take 1 minute to write (1/12)*72 = 6 lines of code

if 6 lines need 1 minute then 72 lines need (72/6) minutes = 12 minutes

Ans : 12

Ans 12
To solve this kind of question you should use your imagination rather than formula.Imagine there is a room, programmer are programming and there is a watch on the wall.
12 programmer writes 12 lines of code in 12 min. if in that room 72 (6 times) programmer comes and sit together ,then in 12 min they would write 72 lines of code (because each 12 programmer group would write 12 lines of code 12+12+12+12+12+12=72) .so in 12 min 72 programmer would write 72 lines of code.

2nd type of question usually asked is
"Suppose 12 such programmers take 12 minutes to write 12 lines of code in total. How many lines of code can be written by 72 programmers in 72 minutes?"

ans 432
12 such programmers take 12 minutes to write 12 lines of code.Now in the room 72 programmer are writing the code.in 12 min 72 programmer would write 72 lines of code(each group of 12 programmer would write 12 lines 12+12+12+12+12+12=72 lines).in next 12 min 72 programmer would write 72 lines more. next to next those 72 programmer would write 72 lines and so on. so in 72 min 72 programmer would write 72+72+72+72+72+72=432 lines

3rd type of question usually asked is
"Suppose 12 such programmers take 12 minutes to write 12 lines of code in total. How many programmers can write 72 lines in 72 minutes?"

ans 12 programmer
12 programmer are sitting in room , in 12 min they would write 12 lines. in next 12 min they would write 12 lines more . in next to next 12 min , 12 lines more .so on ..12+12+12+12+12+12(72 min)and total lines 12+12+12+12+12+12(72 lines) . 12 programmer would write 72 lines in 72 min.

Say YES !!!!!!!!!!!!!

12:12:12::72:72:x
then we havw formulw a:b:c::d:e:f
a:b:f::d:e:c then
12:12:x::72:72:12
we get
12:x:72:72
a:b::c:d
a*c=b*d
72*x=12*72
x=12

Let p be no. of programmers, t be the time and l be the no. of lines

then p*t/l=p*t/l

12*12/12=72*t/72
solving we get
t=12

Ans:12

12 minutes

12

ans is 12

It is 12 minutes.One programmer take 1 minute to write 1 line.1 programmer take 12*12 minutes to write 12 lines.1 programmer take 12*12*6 minute to write 72 lines.Similarly 72 programmers take (12*12*6/72) i.e 12 minutes to write 72 lines of code

72

12

it will take them 12 minutes.

Ans 12
(12×12)/12=72×x/72
By solving
x=12

12 using chain rule