2000=P in a T, 3=S and Y O at the OBG, 5=T on a C(including the s), 3=M and a B and 6=C in the BB?

Question

these are some number/letter problems which are making me rip all my hair off! need some serious help here.. it is for extra credit which i really need. example- 7=W of the W (7 wonders of the world), 12=S of the Z(12 signs of the Zodiac)

Answer 1

2000=P in a T,  ---  pounds in a ton

3=S and Y O at the OBG,  ---  strikes and you're out at the old ball game

5=T on a C(including the s),  ---  tires on a car ...

3=M and a B ---  men and a baby

6=C in the BB?  ---  Children in the Brady Bunch

(had to look 6= up, never having seen the show.)