Question

Erik added 23 new contacts to phone list He had to delete 18 old contacts before could add any more. He now has a total of 100 contacts. Let c represent how many contacts had on phone list before updated it. Write an equation and then solve for c.

Answer 1

c+23−16=100

c=93

Explanation:

Answer 2

c-18+23=100

c=95

Explanation:

to prove that the answer is 95 subtract the 18 that she deleted to get 77 then add the 23 that she added after deleting 18 and you get 100