Erin is 8 years younger than twice paula’s age. the sum of their ages is 40. how old is erin

You do the sum(40) subtracted by 8, the answer from that divided by 2 since Erin's two times younger.
40-8=32
32÷2=16
Then if you want to check it you do the opposite and get the same sum(40) so 16×2=32 and 32+8=40

Yes, that is the correct formula. to solve this problem given the number of years, plug in the number of years for t and plug the whole thing into the