The numbers on two consecutively numbered gym lockers have a sum of 123. what are the locker numbers?

Can somebody me out with this question

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin