answer both questions fast with formulas ??

Answer:
[tex]\frac{p}{2}+3 [/tex]
Step-by-step explanation:
Subtract 3 bags of "safe measure" rice:
12 - 3 = 9 bags
Each bag serves 2 people: 2 x 9 = 18 people
Therefore, [tex]\frac{18}{2} +3=12[/tex]
So the answer is [tex]\frac{p}{2}+3 [/tex]