Question

What is the numerical equivalent of setenta y seis?

Answer 1

76!!!! because setenta is 70 and seis is 6

Answer 2

Setenta y seis is 76!

Setenta is 70 (seventy) and seis is 6 (six)

and the multiples of 10 and the multiples of 1 are joined by "y" in Spanish. 

Some other examples: 

sesenta y seis: 66 (sixty and six)
sesenta y siete: 67 (sixty and seven)