Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

The more of this there is, the less you see. What is it?

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???

Find the smallest sentence with all the English alphabet.

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Which five letter word can be added at the end of below word to form a
valid word?

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_ _ _ IE _ _
_ _ _ IE _
_ _ IE _ _
_ _ IE _
_ _ _ _ IE

Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?