Answer:
8/3 total or 2 2/3
Step-by-step explanation:
4 x 4/6 is the same thing as...
4/1 x 4/6
Multiply straight across...
16/6
Simplify...
8/3 total or 2 2/3
:)
Okay so you're trying to find the unit rate of 720yds/4min. If you divide 720 by 4 you will have the unit rate as 180yds/1 min or 60 sec then if you divide 180 and 60 by 4 again you will get the answer of 45yds/15sec.
Well there is to equations here that must be equal. X+20=4X Four times old means 4X+X=5X.
If you work to simply the problem you get something that looks like this:
X+20=5X
20=4X
x=20/4 or 5 y/o!