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On-line solution of mathematical problems
1: A barrel of cooking oil is 50% used, and there are 20 kilograms left. How many kilograms is this barrel of cooking oil?

20 kg accounts for 50%, so a * * * has 20/50%=40 kg.

Master Wang processed a batch of parts. On 1 day, 25% of the parts were completed, and the next day, 35% were completed. There are still 360 parts to deal with. How many parts are there in this batch?

The rest is (1-25%-35%)=40%, which is equivalent to 360, so a * * * has 360/40% = 900.

3. There are 48 dance teams in the school, and the chorus is 25% more than the dance team. How many people are there in the dance team and the chorus?

A * * * has 48+48( 1+25%)= 108.

There are 2400 Jin apples in the fruit shop, and the weight of the remaining apples after selling is 40% of the weight of pears. How many kilograms of pears are there in the fruit shop?

The remaining apples = 2400 * (1-1/3) =1800kg.

The weight of pear = 1800/40% = 4500kg.

5. The original price of a refrigerator is 3,500 yuan, with the first price reduction of 1 0% and the second price reduction of 10%. What's the current price of refrigerators in this shop?

Current price = 3500 * (1-10%) (1-10%) = 2835 yuan.

Question 2: The following are the results of three classes in grade six in Spring Festival travel rush:

Class 1, Grade 6: 82; Class 2, Grade 6: 65; Class 3, Grade 6: 72; Total score: 2 19.

Question 1: What percentage does the sixth grade 1 class account for in the total score? (Keep one decimal place before the percent sign)

82/2 19=37.4%

Question 2: What percentage is the grade of Class 3 in Grade 6 higher than that of Class 2 in Grade 6? (Keep one decimal place before the percent sign)

(72-65)/65= 10.8%