Can you make four (4) nines (9) equal 100?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

A man dies of old age on his 25 birthday. How is this possible?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100