Question

Jamil traveled 210mile, which is 70% of the total distance to his grandfather's house.How many more miles does he need to travel to reach his grandfather'shouse?

Answer 1

i think it's something like this:

210=70%
x=100%

210(mile):7=30mile

10%=30mile

30×10=300mile

300-210=90mile

I don't know if it's true, I used to do it like this i think