The number of roses was 15 greater than twice the number of prunes. if the roses and prunes totaled 255, how many roses were there?

X=number of roses

y=number of prunes

we can suggest this system of equations:

x+y=255

x=2y+15

We can solve this system of equation by substitution method.

x=2y+15

(2y+15) + y=255

3y=240

y=240/3

y=80

x=2y+15

x=2 (80) + 15

x=160+15

x=175

Answer: there was 175 roses and 80 prunes.