Jamil traveled 210 miles, which is 70% of the total distance to his grandfathers house. How many more miles does he need to to reach his grandfathers house?

He needs to travel 90 more miles to reach his grandfathers house

Step-by-step 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