Question

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.

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