If eleven plus two equals one, what does nine plus five equal?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

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

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

When it's bad luck to meet a black cat?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

A gardener planted the Lemon trees in a mathematical ordered way (i.e. he planted a tree in rows).
He created a total of 19 rows of trees.

Note: There should be more than 2 trees to count as a row.

What is the minimum number of trees required by the gardener to have 19 rows of trees?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?