80 + 32 + 64/5 +
Geometric sequence = going from one number to the next multiplies or divides by the same number for each step.
32/80 = 2/5
Will it work for the next step?
(64/5)/32 = 64/160 = 2/5
Yes.
For each following step, just multiply the previous number by 2/5
80, 32, 64/5, 128/25, 256/125, 512/625, 1024/3125