20,484, 163 = 2x10,000,000 + 4x100,000 + 8x10,000 + 4x1,000 +1x100 +6x10 +3x1
Hope this helps :P
It would half 8 hours to get 4 hours and 20 dogs
Next add the 4 hours and 20 dogs to the 8 hours and 40 dogs so
4+8=12 hours
20+40=60 dogs
So Ken can walk 60 dogs in 12 hours
B
Because 2 sqrt5 is = to sqrt 20.
4^2=16, 6^2=36
