| 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.
| 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. |
| 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. |
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