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The little squirrel picked some mushrooms. Their water content is 99%. After a little drying, the weight is reduced by 5kg, so the water content is reduced to 98%? Put ideas and plans into practice. Write down
Suppose that the mass of the uncoated mushroom is XKG, its moisture content is (x × 99%) kg, and the moisture content of the dried mushroom is (X-5) 98% kg
X×99％－（X－5）×98％＝5
Solve the equation; X = 10 (kg)
10-5 = 5 (kg)
A: the dried mushrooms weigh 5 kg
The three wheeled sidecar motorcycle has three wheels: front wheel, left rear wheel and right rear wheel. If the tire is placed on the front wheel, it can travel 45000 km, if the tire is placed on the left rear wheel, it can travel 20000 km, if the tire is placed on the right rear wheel, it can travel 36000 km. An existing three wheeled sidecar motorcycle with new tire can replace the two tires at the right time, How many kilometers can this three wheeled motorcycle run without buying new tires? How many times should the tires be exchanged at least during this period? When should the two tires be exchanged?
For the problem you mentioned, I consider it according to the following ideas: 1. Calculate the minimum mileage of a motorcycle from the beginning of three new tires to the reappearance of three new tires without changing tires, that is, the minimum common multiple of 20000, 36000 and 45000 is 180000 km. 2. Calculate the mileage of a motorcycle to 18000 km
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