We're going to Grandma. We still have 24 km left. How far does Grandma live if we have traveled from the total distance: half, a third, a fifth?

Correct result:

a =  48 km
b =  36 km
c =  30 km


 24=aa/2  a=48=48 km
 24=bb/3  2b=72  b=36=36 km
 24=cc/5  4c=120  c=30=30 km

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