Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Count the number of triangles in the picture below:

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?