All Puzzles

It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct tendigit numbers.
But do you know how many of these numbers are prime?
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John had a bag containing colourful marbles. The colours are red, green and blue. The total number of marbles he had in his bag was 60. There are 4 times as many red marbles as green marbles. 6 more blue marbles than green marbles. How many marbles of each colour did John have?
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I guess 76.8% of readers will like this riddle.
What’s the least number of people who should read this post?
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