Answer:
6; 9; 12
Step-by-step explanation:
It's possible because they cut cakes into different no. of slices
Luke: 2/3 of the cake are 4 slices
Entire cake 4/(2/3) = 4×3/2 = 6 slices
Kira: 2/3 of the cake are 6 slices
Entire cake 6/(2/3) = 6×3/2 = 9 slices
Ali: 2/3 of the cake are 8 slices
Entire cake 8/(2/3) = 8×3/2 = 12 slices
5 different orders. hope this help