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Number Puzzles Questions and Answers

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10. What number should replace the question mark?
Ans: 18.
Sol.
Multiply the bottom numbers to obtain the numbers at the top, albeit they are at the top of a different pyramid.
 
11. What number should replace the question mark?
Ans: 10.
Sol.
Each diagonal line of numbers, starting with the top left hand corner number, increases by 1 each time, ie :
 
12. What number should replace the question mark?
24, 30, ?, 60, 84, 114
Ans: 42.
Sol.
The sequence progresses +6, +12, +18, +24, +30.