Question

Mary can build 2 sand castles ( c ) in 4 hours ( t ). Write an equation in the form of c=rt that represents the relationship between the number of sand castles (c) and time (t), where r is the constant of proportionality.

Answer 1

2 = r(4)
To find r, you've gotta divide it out.
2/4 = r/4
1/2 or 0.5 = r

c=(0.5)t