As you can see, the side length of the cube is 8.

The height is 10.

Surface area = 8 * 8 * 2+8 * 4 *10 =128+320 = 448.

The pass rate is the percentage. When the total is different, the percentage can't explain the number.

If I have two, one is 50% qualified, I have ten and five are 50% qualified.

Because the topic doesn't mention the ratio of male to female in 100 students, it is ok if there are girls in school A and boys in school B.

The third question is shown in the picture: pour water 9 times.