misunderstanding of "the answer is.."

this is the condition of one class in X high school
teacher : allright students, lets continue our lesson
(explaining)...
lets have a try on some questions in your book, page 24, i ll give you 5 minutes to do the exercise (just 3 questions)
(5 mins after)
teacher: have you finished?
students: yes ma'am
teacher: ok then, lets discuss together
*question 1.
how many kj a day are needed by a teenage girl?
teacher: the answer you can find by urself there on page 22
*question 2.
which kinds of food contain saturated fat?
teacher: the answer is on the page 22 part 4.19
*question 3.
explain the difference between starvation and malnutrition!
teacher: the answer is on the page 23 part 4.21

one of the students: so those are the answers ma'am?
teacher: absolutely. attention please! we're gonna have this chapter test on fri
students: booo!
teacher: its gonna be so easy if you study

----------
on the day
*the test questions
1. Explain the difference between starvation and malnutrion!
2. How many kj a day are needed by a man doing light work?
3. Which kinds of food contain saturated fat?
4. What is the definition of,
a.digestion
b.ingestion
c.absorption

one of the students answers (he was the student who asked the teacher)
1. On the page 23 part 4.21
2. You can find the answer by urself there on page 22
3. On the page 22 part 4.19
4. On the page 25 figure 4.9

the test result,
he got '0'
he protested to his teacher: ma'am why i got 0?
teacher: because your answers are wrong
students: dont you remember when i asked you bout the answers?
teacher: yup, then?
students: so what was your answer when i asked you "are those the answers"
teacher: i replied "absolutely"
students: so why i still got '0', i answered them correctly as you said
teacher: (-___-)???????


this just a joke.lol..