If x:y = 2:5, find the value of (-x+3y):(2x+y)
x = 2y = 5
-2+ 10:4+5
8:9
x/y = 2/5
5x = 2y
x = 2/5 y
(-x+3y) = (-2/5y+3y) = 13/5 y 2x+y = 2(2/5y)+y = 9/5 y
13/5 : 9/5
13:9
+37153 
