Hard Aptitude Number

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?




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Solve the following series:
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How Come ??

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A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

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Count the number of squares in the picture below.

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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.