I need the answers AND assumptons

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?

6cm10 cma conical paper cup has dimensions as shown in the diagram. how much water can the cup hold when full?

Arace is 10 kilometers long. markers will be placed at the beginning and end of the race course and at each 500 meter mark. how many markers are needed to mark the course for the race?