combine the y's and the regular numbers
17y=51
divide 51 by 17
y=3
Nine times thirty-eight can also be thirty-eight times nine or (18 divided by 2) multiplied by 38 or like this
(18/2)times(38/2)
I hope this gives you an idea
X represents the number that would be added to the silver cars.
x/40= 4
X=40x4
x=160
Subtract the given 20 from 160 because 160 is the total number
160-20=140
Therefore 140 would be added to 20 silver cars to get the ratio1:4
