Four ppl spent was $90 and that each of them had spent exactly 1/3 of the total. How can this be?

Question

Two mothers and two daughters went shopping yesterday. As they went home they added things up and discovered that the total amount spent was $90 and that each of them had spent exactly 1/3 of the total. How can this be?

Answer 1

There are only 3 people:the grandmother, the mother , and the daughter.

The grandmother and the mother are the two mothers and the mother and the daughter are the two daughters.