There are three circles. The first circle says left 20, right 20, right 20, below 10. Second, write 18 on the left, 16 on the right and 8 below. Third, it says: 25 on the left. What's under the right?

Answer:

First lap: left: 20, right: 20, bottom: 10.

The second lap: left: 18, right: 16, bottom: 8.

The third lap: left: 25, right: 30, bottom: 15.

It should be: left-10 = down, right /2 = down.

The first circle 20-10 =10 20/2 =10.

The second circle18-10 = 816/2 = 8.

So: the third lap 25-10 =1515 * 2 = 30.