Question 1192889
{{{NR*T=J}}}
N, how many cats
R, the rate of killing mice for just 1 cat
T, time in hours
J, amount of work (or mice killed)


First sentence, r for rate
{{{12*r*12=12}}}


Second sentence, t for how much time
{{{2020*r*t=2020}}}


Divide the second sentence equation by the first sentence equation.
{{{(2020*r*t)/(12*12*r)=2020/12}}}

{{{(2020t)/(12*12)=2020/12}}}

{{{t=(2020/12)((12*12)/2020)}}}

{{{highlight(t=12)}}}