Mark was mixing blue and yellow paint ratio of 2:3 to make green paint. he wants to make 45 liters of green paint. he began to make a table to help him think about the prolbem, but is unsurw of what to do next.

Blue : Yellow : Green
2 : 3 : 2+3
2 : 3 : 5

5 parts = 45 liters
1 part = 45÷ 5 = 9 liters
2 parts = 9 x 2 = 18 liters
3 parts = 9 x 3 = 27 liters

To make 45 liters of green paint, he needs to have 18 liters of blue paint and 27 liters of yellow paint.