Final answer:
Your mom ate 1/4 of the entire cake.
Step-by-step explanation:
To find out how much your mom ate of the entire cake, you need to multiply the fraction of the cake she had by the fraction she ate.
Your mom had 3/4 of the cake and she ate 1/3 of it.
To calculate, you multiply the fractions:
(3/4) × (1/3) = 3/12 = 1/4
Therefore, your mom ate 1/4 of the entire cake.