Respuesta:
Ejemplo:
Sam: Hi Katy, what are you doing?
Katy: I have finished my homework and now I am watching TV.
Sam: Did you do the exercise seven? It was very difficult
Katy: Yes, because my sister explained me. If you want, she can explain you the exercise.
Sam: Yes, please. I don´t understand nothing about it.
Katy: Ok. Sara, can you come, please?
Sara: Of course, what do you need?
Katy: Can you help Sam with the exercise 7?
Sara: Yes, the exercise say "Two boys are walking around a path and, when they had done the 2/7 of the walk, they stopped to rest. Then, they did 2/3 that remain. If they have to walk 2,3 km to finish their route, how many km is the walk?". I think you have to know the operation that you have to do to know the length.
Sam: Yes, it might be 1/3 of 5/7 of x is 2,3 km.
Katy: and now you would do the operation.
Sara: and it is 1/3 multiply by 5/7 multiply by x is equal to 2,3.
Sam: now I have that 5x/21 is 2,3. Is it ok?
Sara: yes, it is perfect. Next, you have to multiply 21 by 2,3 and the result divide it by 5.
Sam: and, is it the result 9,66?
Sara: yes
Sam: oh, my phone is ringing, is my mum. Hi mum.
Sam´s mum: where are you?
Sam: I´m at Katy´s house, I tell you yesterday.
Sam´s mum: oh yes, I forgot it. Can you go buying some pasta for the dinner?
Sam: of course, Katy and I are going to go to the mall to meet some friends.
Sam´s mum: really? so you can take back the dress that I shop the last week.
Sam: ok mum. See you later.
