Question

8 miles is approximately equal to 6 km. How many km are equal to 28

miles? How many miles are equal to 42 km?

Answer 1

Given, 8mi=6km
Then, 28mi=?km
Using unitary method,
If 8mi=6km
then, 1 mi= 6/8=3/4 km
So, 28mi= 3/4 * 28= 3*7=21km
Again, If 6km=8mi
Then, 1km=8/6=4/3 mi
So, 42km=4/3 *42=4*14=56miles

Answer 2

By unitary method
8miles=6km
1miles=6/8km
28miles=6/8*28
Similarily
6km=8miles
42km=8/6*42