The math teacher asked edith, “how old are you? ” “sixty years less than five times my brother’s age,” she answered. “that doesn’t me,” replied the teacher. “yes, it does,” said edith, “he and i are twins! ” how old is edith?

15 years

Step-by-step explanation:

Let e represent Edith's age.  Then e also represents her brother's age.

Then:

e = 5e - 60.

Consolidating the e terms, we get 60 = 4e.  Thus, e = 15.

Edith is 15 years old.  So is her brother.

answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0