when Miguel was six years old his little sister leila was half of his age if Miguel is 40 years old today how old is leila

Leila is 37 years old.

Step-by-step explanation:

If Leila was half Miguel's age when Miguel was 6, Leila had to have been 3 years old. This tells you that Leila is 3 years younger than Miguel. Subtract 3 from 40 to get 37.