Hi Alexis.
This requires some thinking . . .
24 people speak English and there are 29 people in all.
That leaves 5 people who don't speak English.
3 of those people don't speak English or Spanish.
That leaves 2 people who speak only Spanish and no English.
Since there are 11 people who speak Spanish, 9 of them speak Spanish and English.
Comprendo??
Dan