Answer:
He needs to travel 90 more miles to reach his grandfathers house
Explanation:
The distance already covered can be expressed as a percentage of the total distance as shown;
t=p×T
where;
t=distance traveled by Jamil
p=percentage of total distance already traveled
T=total distance to grandfathers house
In our case;
t=210 miles
p=70%
T=unknown
replacing;
210=(70/100)×T
T=210×100/70
T=3×100=300
T=300
The total distance to grandfathers house=300
Remainder=Total distance-distance already covered
where;
Total distance=300 miles
distance already covered=210 miles
replaced;
Remaining distance=300-210=90 miles