Question

the ratio of green houses to white houses on winthrop street is equal to 2 to 3 . there are 60 white houses on winthrop street. How many green houses are there?

Answer 1

2/3 = g/60
cross multiply because we have a proportion
3g = 120
g = 120/3
g = 40....so there are 40 green house

Answer 2

green:white=2:3
x:60

60/3=20 so you multiply 2 by 20 to get the amount of green houses:
2*20=40
There are 40 green houses.

Hope this helps :)