Assuming your fraction is 1/8 of the pie, there will be 16 guests at the party.
Explanation:
You have to take the 1/8 and realize that each pie will be broken into 8 pieces. Since you have 2 pies you have to multiply this number by 2. This gives you 16 pieces for all 16 members that will attend the party.
The descent of the balloon would take 14 minutes To find the answer to this problem, take the elevation change (315) and then divide it by the rate of descent (22.5)