Problem of the week

What I know
- it takes 5 hours to cut the entire lawn using the push mower for 70 minutes
-90% of the lawn was used by the powerful riding mower
-Rest was used by the push mower
?How many minutes did it take manny to cut the entire lawn

Solution

90% o f70 minutes
90%-= 0.90
0.90x70=x
63=x
It takes 63 minutes to cut 90% of the lawn with the powerful riding mower

100%-90%=10%
He has 10% of the lawn to mow with the push mower 

5x60=300 minutes to cut of 10% of the lawn

10% of 300 minutes

10%=0.10
0.10x300=x
30 =x
It took him 30 minutes to cut 10% of the lawn with push mower

63=30=93 minutes to cut the entire lawn using the powerful riding mower for 90% and push mower for 10%