Equation Analysis Help for 5th Grader

My class was given a list of 26 equation analysis statements. We have all but this one:

2 = S of R in RB

Can anyone help? I looked in the archives and couldn't find the answer.

Thanks

S

P

O

I

L

E

R

S

P

A

C

E

Scoops of Raisin's in Raisin Bran

Two scoops of what though?

Raisins (dried grapes)

Actually, if the phrase was written properly, it should have been (using the usual notation that * denotes a proper noun):

2=S of R in K* R B

Which, of course, simply adds 'Kellogg's' into the phrase.

Oh, the first 'Raisins' should not be a possessive- just a plural.

Yes, and 'relief' is spelled R-O-L-A-I-D-S.

Cheers!