First 1/5 is equivalent to 20% so to get 20% of both of them multiply by .2. so 400×.2=80 and 90×.2=18
I don't know what you mean by unknown factor but a quotient is the answer of a division problem
30+5=5+30 with commutative property or 30+5=35
The interest is 3.5 percent or 3 percents of the sum she deposited.
8 foot path
1st step = 8/2 = 4ft
2nd step = 4/2 = 2ft
3rd step = 2/2 = 1ft
4th step = 1/2 = 1/2ft
So he covered 7 1/2 ft (or 7.5ft)