Puzzles - Number puzzles

136.
Answer
:
6
Explanation
:
For each star, add the outer numbers together and divide by 3 for the left hand, 4 for the centre, and 5 for the right hand, putting the result in the centre.

137.
Answer
:
12
Explanation
:
Add together numbers in corresponding segments of the upper two and lower left circles to give the values in corresponding segments of the lower right circle.

138.
Answer
:
3
Explanation
:
Starting at the top and moving down, reading each pair of boxes as a 2 digit number, add the separate digits to the 2 digit number as a whole, and put the result in the 2 boxes below. Continue this sequence as you move down.