In the following four numbers, three are same in certain way, while the rest one is different. Find out the different one.

65-5×7+(8×4-2-1) = ?

Today is Monday. After 100 days what day it will be

A and B are two cities. A man travels from A to B at a speed of 10 km/hr. and returns back at the speed of 30 km/hr. Find his average speed for whole journey

Meena, Arun and Gopu divide a sum of Rs. 6,000 in such a way that Arun gets 1/2 of what Meena gets and Gopu gets 3/4 of what Arun gets. Then what is Arun's share

80,76.5,69.5,59,48,27.5