What is black when you buy it, red when you use it, and gray when you throw it away?

I have Rs.50 and I spend it in the way as below.

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?

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

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Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Two Twins Jack and Jill were standing back to back and suddenly they started running in opposite direction for 4 kilometres and then turn to left and run for another 3 kilometres.

what is the distance between the Baggio twins when they stop ?

Using Only Five 5's and any mathematical operator make sum as 37

What goes up but never comes down?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.