Puzzles - Number puzzles
Exercise : Number puzzles
19.
Answer
:
253
Explanation
:
Starting at the top left, and moving through the diagram in a Z shape, double each number and add 3 to give the next number along.
20.
Answer
:
51
Explanation
:
Moving to the right, double each number and subtract 3 to give the next number along.
21.
Answer
:
2
Explanation
:
Starting with the 10 at the top, one set of numbers increases by 3 each time, written in alternate boxes as you move down the diagram, and the other set of numbers decreases by 2, written in the boxes remaining.
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