Question 170479
so Jack can do 1/7 of the job per hour and Marlyn can do 1/4 of the job per hour
:
1/7(t)+1/4(t)=1(job)----->find common denominator---->28 --.so multiply by 28
:
4t+7t=28
:
11t=28
{{{highlight(t=28/11)}}}or 2 6/11 hours for both to mow the lawn