If chris and lisa went shopping and spent a total of $25.50 and lisa spent $13.50 more then chris spent. how much did lisa spend?

I think you just subtract the total - the money lisa spent

lets try it

25.50$-13.50$ = 12$

so we all know that its 12$

wanna PROVE IT , try adding 12$+13.50$ =

it will give us the total ;p

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.