2 cans of paint and 1 roller for $30 bought 3 more cans and 2 more rollers for $50. How much did 1roller cost?

To paint his house, Samuel bought 2 cans of paint and one roller for $30. When friends came over to help, he went back to the store and bought three more cans of paint and two more rollers for $50. How much did he pay for a roller?





dollars per roller =?2 cans of paint and 1 roller for $30 bought 3 more cans and 2 more rollers for $50. How much did 1roller cost?
errr $10?2 cans of paint and 1 roller for $30 bought 3 more cans and 2 more rollers for $50. How much did 1roller cost?
2c+1r=30 set 1


3c+2r=50 set 2


3*set 1 : 6c+3r=90


2*set 2 : 6c+4r=100


diff .......1r =10


r=10