Question

Cellular respiration generates a total of 36 to 38 ATP molecules. How many of these come solely from glycolysis?

Answer 1

From glycolysis, you get:

2ATP
2NADH (when it enters the ETC you have to multiply by 3) = 6 ATP

from glycolysis only, 8 ATPs

Answer 2

2 ATP molecules, as,
Glucose + 2 NAD+ + 2 ADP + 2 Pi → 2 Pyruvate + 2 NADH + 2 H+ + 2 ATP + 2 H2O