Luke started a weight loss program. The first week, he lost X pounds. The second week, he lost 3/2 pounds less than 3/2 times the pounds he lost the first week. The third week, he lost 1 pound more than 3/4 of the pounds he lost the first week. Liam started a weight-loss program when Luke did. The first week, he lost 1 pound less than 3/2 times the pounds Luke lost the first week. The second week, he lost 4 pounds less than 5/2 times the pounds Luke lost the first week. The third week, he lost 1/2 pound more than 5/4 times the pounds Luke lost the first week.

The expression for Luke’s weight loss over the three weeks is?

The expression for Liam’s weight loss over the three weeks is?

The number of pounds Luke lost in the first week is?

The number of pounds Luke and Liam each lost over the three weeks is?