IF mark has 5 shirts and he gives 3 apples to lisa. How much donkeys would he have left?

Itook a better photo of the question so y’all can see it i hope it’s a fine photo

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?

I’m really confused and need to learn this