A football is made of black and white leather blocks (as shown in the figure). Black Leather blocks can be regarded as regular pentagon and white leather blocks can be regarded as regular hexagon. If there are 32 black and white leather blocks on a ball, please calculate the number of black and white leather blocks?

A football is made of black and white leather blocks (as shown in the figure). Black Leather blocks can be regarded as regular pentagon and white leather blocks can be regarded as regular hexagon. If there are 32 black and white leather blocks on a ball, please calculate the number of black and white leather blocks?

If the black skin block has x blocks, then the white skin block has (32-x) blocks. According to the meaning of the question, we can get: 5x = 3 & nbsp; (32-x). 5x = 96-3 & nbsp; x.5x + 3 & nbsp; X = 96.8x = 96.x = 12, then the white skin block has: 32-12 = 20

A mathematical problem
An express train is 306 meters long and a slow train is 344 meters long. It takes 13 seconds for two trains to run in opposite directions. If two trains run in the same direction, it takes 65 seconds for the express train to run after the slow train and leave the slow train?

If the speed of fast train is XM / s and that of slow train is YM / s, then
13(x+y)=650
65(x-y)=650
We get x = 30
y=20