Can you replace the question mark with the correct number?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

How is the moon similar to a dollar?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

People make me, save me, change me, raise me. What am I?

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

_ _ _ 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.