I'll go with C

3*Pizzas = Hot Dogs & 5*Hot Dogs = Brownies

S1 - Insufficient; the number of pizzas can be anything greater than or equal to 10 & the number of brownies will be 15 times that amount. Hence, insufficient
S2 - Insufficient; again, the number of brownies can be 5 times of any multiple of 3 (the restro only keeps food items in whole numbers and hence number of hot dogs should be divisible by 3)

If we combine S1 & S2, the only qty that fits the bill would be 10 Pizzas & 30 Hot Dogs & hence 150 brownies.

Answer: C

We know that HD=3P ⇒ HD is a multiple of 3: ..., 33, 30, 27, ...
and B=5HD

1- P >= 10
if P=10 ⇒ HD=30 and B=150
if P=11 ⇒ HD=33 and B=165
Two or more possible answers ⇒ not sufficient

2- HD <= 32, we know that HD should be a multiple of 3
if HD=30 ⇒ B=150
if HD=27 ⇒ B=145
Not Sufficient

-1- and -2- together are sufficient. P=10, HD=30, and B=150

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources