What is always in front of you but can’t be seen?

When 99 is considered higher than 100?

What does below pictogram mean?

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

How do you go from 98 to 720 using just one letter?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

What is next number in the pattern below:

131 517 192 123 ?