Kim's weekly pay is two thirds of Alicia's. Together they earn $600 per week

A + k = 600

k = 2/3a

a + 2/3a = 600

3/3a + 2/3a = 600

5/3a = 600

a = 600 * 3/5

a = 1800/5

a = 360

k = 2/3a

k = 2/3 (360)

k = 720/3

k = 240

so Kim's pay is $ 240 and Alicia's pay is $ 360