Anna is 8 years older than her sister how old is anna if the sum of their age is 32
Anna is 24 years old.
A 5th grader could get the correct answer for this easy problem
however our robot tutor missed it.
sister's age --- x
Anna's age --- x+8
x + x + 8 = 32
2x = 24
x = 12
So Anna is 20 and her sister is 12
check: is the sum of their ages 32 ? YES
is Anna 8 years older than her sister ? YES
The robot's answer leads to a contradiction, so it is wrong again.