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

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