You should look at it this way (sideways) and follow, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,1. . . . . End to end, it's easy to read. So you can see the picture by adding it to 60. This is a tricky method, you have to look carefully to see it. Having said so much, you should understand. . You can get 60 = (7,5). .