Any of 100 can get the calculator.
Any of remaining 99 can get the tablet.
Any of remaining 98 can get the smart pen.
question: how many people can she serve?
answer: she can serve 16.66666667 people. so she can only give 16 people a complete serving.
question: does she have enough ice cream for her guests?
answer: no. explanation: she only has enough for 16 people to have a full serving. however, she can give a 17th person a partial serving.