Puzzles - Number puzzles
Exercise : Number puzzles
172.
Answer
:
57
Explanation
:
As you work down the column, numbers follow the sequence of Square Numbers from 16 to 81, subtracting 4, then 8, then 12 etc.
173.
Answer
:
1
Explanation
:
Splitting the diagram into 3 smaller triangles, with 3 circles each, the sum of the numbers in each smaller triangle is always 21.
174.
Answer
:
69
Explanation
:
Starting at the top and working down, double each number and subtract 5 to give the next number down.
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