In Rakib's opinion, his weight is greater than 65 kg but less than 72 kg. His father does not agree with Rakib, and he thinks that Rakib's weight is greater than 60 kg but less than 70 kg. His sister's view is that his weight cannot be greater than 68 kg. If all are correct in their estimation, what is the average of the different possible weights of Rakib?

Question: In Rakib's opinion, his weight is greater than 65 kg but less than 72 kg. His father does not agree with Rakib, and he thinks that Rakib's weight is greater than 60 kg but less than 70 kg. His sister's view is that his weight cannot be greater than 68 kg. If all are correct in their estimation, what is the average of the different possible weights of Rakib?

Solution:
Let Rakib's weight by X kg.
According to Rakib: 65 < X < 72
According to Rakib's father: 60 < X < 70.
According to Rakib's sister: X <= 68

The different possible weights of Rakib or the values that satisfy all the above conditions are 66, 67 and 68.
So, the Average of different possible weights of Rakib = (66 + 67 + 68)/3
= 201/3
= 67 kg.