It is said that Tang Priest encountered numerous difficulties and obstacles all the way to the West.

It's a long road. After a day and a night, Bajie began to complain: "When did it take so long?"

Wukong saw that Bajie was so lazy. Oh, "Idiot, can't you count yourself?"

Friar Sand took out a map from his bag and said, "I heard that Buddhist scriptures are in the Lingxiao Hall." (See attached map on the second floor)

"Just count 32+2+57+43+8+48+62, Wukong and Bajie," said the Tang Priest.

Bajie was the laziest and complained, "How difficult it is to add up so many figures!"

Wukong added, "Look, idiot, 2 and 8, 48 and 32, 43 and 57 can all make up an integer like10,80, 100, plus 62. With additive commutative law and the law of association, it can be calculated like this: "

(2+8)+(48+32)+(43+57)+62

= 10+80+ 100+62

252 kilometers

"252 kilometers, master!"

"good!" The Tang Priest said, "Go!"

On the way, Wukong and Bajie discussed how long it would take to get to the Western Heaven.

"Monkey," Pig asked, "how long before we go to the Western Heaven?"

Wukong: "Well, you must know your own speed first!" " "

Bajie: "4 km/h"

Wukong: "We still need to know how long we walk in a day."

Bajie: "1 24 hours a day."

Wukong: "Although it is 24 hours, we still need to remove the time for eating, sleeping and resting. Let me calculate. The host takes a rest every 2 hours 15 minutes and feeds forage for nothing. Moreover, every 15 days, we have to go to a nearby store to buy some food or supplies ... "

"Also, I have breakfast for half an hour every day, lunch and dinner for 1 hour, sleep for 8 hours at night, and take a nap 1 half an hour ..."

"Come on!" Wukong interrupted Bajie: "Don't say those boring words again!"

Wukong added, "In that case, we can actually spend only 24-0: 05-1-1-8-1:05 =12 hours a day, and we have to rest for 0: 25 hours every two hours./kloc-"

"In 1 day, there are 10 points and 5 hours to travel. It takes 25200/4=6300 hours, which is 600 days? #65308; Author: Xi Sun Hemei? 00/ 15=40 days, 640 days "

Pig sighed, "Hey, it takes 640 days and nights to go once, so long!" "

"hmm." Wukong said, "Once and for all, it will take 1280 days and nights, that is, three and a half years!" But if you walk so slowly, it's even slower. Let's go! "

On the way, Bajie kept complaining: "Three and a half years, such a long time ..."

3。 Room number problem (simple algebra)

As night fell, in the evening, Tang Priest Stuart and other four people wanted to find a hotel to stay.

There is a small town nearby. Four people want to stay in a three-story hotel in this town. When they reached the city gate, the guards stopped Wukong, Bajie and Friar Sand because they looked strange. Tang priest is busy showing customs clearance documents. When the guard saw the gold seal of his country on it, he quickly raised his hand and let it go.

Four people entered the city, arrived at the hotel and asked for a room.

Four people went to the third floor, because what Wukong did was just managing the waiter to rent a house, and Bajie didn't hear it, so naturally he didn't know the room number.

Wukong rolled his eyes and said, "How about we ask Pig to take us to the room this time?"

Everyone agreed except Bajie.

Pig said, "Monkey, don't be silly. Tell me the room number so that I can find a room! " "

"Well, well, let me tell you, our room number, plus 7, minus 3, plus 5 times, minus 4 times, multiplied by itself, the result is equal to 1 14. What do you think our room number is? "

"Ah, so complicated?" Bajie thought for five minutes and listed a formula: (x+7-3+5 * 5-4 * 4) * x =114, where x is the room number.

After another 5 minutes, Bajie simplified the formula to: (x+4+9)*x= 1 14.

10 minutes later, Bajie simplified one step: (x+13) * x =114.

At this time, it was completely dark, and all four people were hungry, but everyone was still waiting quietly.

Twenty minutes later, Bajie got the square of x+13 * x =114 by multiplication and division.

After 30 minutes, Bajie finally worked out x=6, and looked it up: (6+7-3+5 * 5-4 * 4) * 6 =114, yes, that's right!

Bajie is happy to take three people to Room 6. On the way, Wukong kept praising. "Yes, Bajie has made great progress in mathematics!"