3rd grade math (not algebra!)
posted by susan on .
There are 18 bikes in a bike rack. There are 4 more blue bikes than yellow bikes and 2 less yellow bikes than green bikes. How many bikes of each color are in the rack?

4 yellow bikes
8 blue bikes
6 green bikes
4+8+6=18 
can you post how you solved it...I can
solve it using algebra.. but can't figure it out otherwise!!! 
Ehh I just knew

There is 10 blue bikes 6 green bikes and 2 yellow bikes

from the information above:
I blue = yellow + 4
II yellow = green  2
OR yellow +2 = green
and we know that
III yellow + blue + green = 18
now insert upper expressions into the III equation:
yellow + (yellow +4) + (yellow +2) = 18
3 yellow + 6 = 18
> yellow = 4
insert 4 into upper equation and you will get
blue= 4+4
green= 4+2 
18 bikes in all. 4 more blue than yellow, 2 less yellow than green, how many green bikes are there?