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

Can you find the key in the picture below?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

What does this mean?

CCCCCCC

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Can you count the number of blocks in the picture below?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?