Monday, Wednesday, and Friday x minutes/day = x/60 hrs/daymariah wrote:for 20 weeks, Mary works x minutes on Monday Wed. Fri. And y minutes on other weekdays.
asked average working Hour per day ?
oa given
[spoiler]3x+4y/420[/spoiler]
pls explain , i m getting wrong answer
So in this total 3 days the total hours will be accumulated to = 3x/60 = x/20 hrs
Saturday, Sunday, Tuesday, Thursday y minutes/day = y/60 hrs/day
So in this total 4 days the total hours will be accumulated to = 4y/60 = 2y/30 hrs
Thus in a week total Mary works = x/20 + 2y/30 hrs
So total work in 20 weeks = 20*( x/20 + 2y/30 ) hrs = x + 4y/3 hrs
Average per day = (x + 4y/3)/(20*7) = (x + 4y/3)/140 = (3x+4y)/420
