Question 1101902
Description gives the impression of just a simple proportion but also may work as a constant rates situation.


r, the consumption rate for 1 person

x,  how many day...

{{{system(10r*12=1,20r*x=1)}}}


{{{120r=20r*x}}}

{{{120=20x}}}

{{{x=12/2}}}

{{{highlight(x=6)}}}------------six days