Final answer:
Sergio is incorrect because startfraction 20 over 20 endfraction is equal to 1.
Step-by-step explanation:
Sergio is incorrect because startfraction 20 over 20 endfraction is equal to 1.
When the numerator and denominator are the same in a fraction, the value of the fraction is always 1. In this case, 20 over 20 represents 1 whole because there are 20 parts out of a total of 20 parts.