Answer:
A
1. Marron
2. Negro
3. Amarillas (normally its amarillo if just one thing is yellow, but since its more than one thing thats yellow, it's amarillas) it
4. Verde
5. Grises (same explination as yellow, but this is more than one gray thing)
6. Blanca
B
1. Roberto y Felipe compran 10 collares
2. Yo compro 50 discos compactos
3. Tu compras 3 carteras
4. Ustedes compran 20 videojuegos
5. Nosotros compramos 12 botellas de perfume
Explanation: Sorry if i got any of them wrong.