OG11-104

As 2 said,none of the six numbers is greater than 75, then how do average of six numbers is 75?

If you understood 1), why don't you know 2)?

From 1) we can infer that， if none of the 6 numbers is less that 75 while the average of them is 75, all the six numbers equal to 75.

Similarly, we can infer that all the six numbers equal to 75 in the case of 2).