Answer:
Unit fraction
Step-by-step explanation:
A unit fraction means 1 unit is the value of the numerator. This means 1 is in the numerator.
1/9 of total marbles = 1/9 × 36 = 4
so Alexis gave 4 marbles to Sara.
And so Alexis is left behind with 32 (36-4) marbles and so Sara have 4 marbles now