Answer:
14
Explanation:
Let us suppose, the number of guests that can be invited as x.
 No. of people Amount of money 
 5 $35
 x(let) $98
Here, the relationship is directly proportional, 
 So, 
 5/x =35/98
 or, x × 35 = 5 × 98
 or, x = 5 × 98/35
Therefore, x = 14
 So, 14 members can be invited to her party if she spends $98 on her retirement party.