The figure shows an ellipse, a circle and a rectangle. What is the sum of the numbers that lie inside the circle?

Numbers inside the circle: 7 (circle only), 5 (ellipse and circle), 11 (circle and rectangle) and 3 (all three). Sum $=7+5+11+3=26$. 23 forgets the 3 in the centre, 22 adds the numbers in the ellipse instead, and 7 takes only the circle-only part.