Puzzles - Number puzzles

142.
Answer
:
27
Explanation
:
In each circle, multiply the top two numbers together, and divide by 2 for the left hand circle, 3 for the centre, and 4 for the right hand circle, putting the result in the lower segment.

143.
Answer
:
5
Explanation
:
Take values in the top left and centre circles and put their sum in correspond- ing segments of the lower left circle. Take values in the middle and right hand circles, and put their difference into corresponding segments of the lower right circle.

144.
Answer
:
22
Explanation
:
Working from left to right, add numbers in the first two boxes together, and subtract 4, to give the next value along.