các bạn giúp mình giải bài toán sau nhé !!!( math violympic đó ): A teacher has a bag of sweet for her students . If each student is given 4 sweet , the remaining number of sweet is 4 . If each student is given 5 sweet , the given will be short of 20 sweet . How many student are there in our class ?

Giúp mình giải nha mình cần giải xong vòng 6 trong ngày mai và ngày mai vì sắp chốt danh sách thi cấp trường rồi , ai giúp mình nhanh mình tặng 3 đúng nha

Ann and Bob have a large number of sweets which they agree to share according to the following rules. Ann will take one sweet, then Bob will take two sweets and then taking turns, each person takes one more sweet than what the other person just took. When the number of sweets remaining is less than the number that would be taken on that turn, the last person takes all that are left. To their amazement, when they finish, they each have the same number of sweets

They decide to do the sharing again, but this time, they first divide the sweets in two equal piles and then thay repeat the process above with each pile. Ann going first both times. They still finish with the same number of sweets each. 

What is the maximum number of sweets less than 1000 they could have started with ?

Answer the questions.

Choose ONE WORD OR A NUMBER from the passage for each answer

How our sweet tooth is hurting us

Over the last three centuries, the amount of sugar in the Western diet has continued to rise. Back at the start of the18th century, a typical English family consumed less than 2 kg of sugar per year. By the end of that century, that amount had risen 400%. Compare that to the 40 kg that people now consume annually in the USA. In Germany, the second-most sugar-loving nation in the world, people eat roughly 103 grams on average per day. In the Netherlands, the country with the third-biggest sweet tooth, people eat 102.5 grams. Of course, there are some countries in the world where sweet food is less popular: in India, peopleeat only about 5 grams per day on average; in Indonesia, it’s 14.5 grams; and in China, it’s just under 16 grams. If you’re not sure what 40 kg looks like, it means that the 
average person in the USA now eats approximately 22 teaspoons of sugar a day. Therecommended limit, suggested by researchers from the World Health Organisation, is no more than 8 if you want to stay healthy, but just one can of soda contains around 10.It is common knowledge that many drinks, in bottles or canned, contain a lot of sugar. Although advertisements say that they are ‘energy-giving’, professional athletes and sportsmen and women usually stay away from them. It is teenagers that are their greatest consumers. And –although advertisers promise that these drinks will make people feel energetic and active –because of the type of chemicals they have, once a person has drunk all the soda, they simply feel hungry instead. However, sugar is also in products that many shoppers find surprising, for example, cereal, which actually hasa lot. Because they believe it is a healthy kind of food, parents buy it for their children’s breakfast.A large part of the problem, according to nutritionists, is that people find it hard to understand the labels on the back of food products. Nutritionists think this should be a lot easier for them. But at the moment, manufacturers don’t have to write ‘sugar’ on them, but can use words like ‘corn syrup’ or ‘dextran’, which can result in confusion for consumers. But why should we be worried about our sugar consumption? Firstly, it is harmful to young children because it causes tooth decay; the pain from this can mean that children don’t get the amount of sleep they need. As a result, they can’t concentrate when they are in class. In this case, schools and governments have a duty to educate them about good and bad food choices. For adults, the problems increase. Eating too much sugar makes people quickly gain weight, it affects the heart and liver, and can lead to diabetes.

1.Which country consumes the least sugar per person? __________________

2.What is the maximum recommended number of teaspoons of sugar that a person should consume a day?  ________________

3.Which group of people drink more sugary drinks than anyone else? ________________

4.How do people really feel after finishing sugary drinks? ________________

5.Which food product has an unexpected amount of sugar? ________________

6.What do nutritionists want to be clearer for consumers? ___________________

7.What may decrease as a result of tooth decay in children? _________________

Sugar tastes sweet because of thousands of receptors on the tongue which connect the substance with the brain. The taste of sweetness is universally accepted as the most pleasurable known, although it is a fructose. Abundant is the most common occurring sugar, (1)______ of which include fruit and honey. Sucrose, which supplies glucose to the body, is (2)______  from the sugar cane plant, and white sugar (pure sucrose) is used by food technologists to (3)______ sweetness in other substances. Approximately a dozen artificial sweeteners have been discovered; one of the earliest was Sorbitol from France.

Manufacturers add large amounts of sugar to foodstuffs but never more than the (4)______ required to produce the optimum pleasurable taste. Surprisingly, this amount is similar for different people and in different cultures. No one has (5)______ discovered a way to predict whether a substance will taste sweet, and it was by chance alone that all the man-made chemical sweeteners were found to be sweet.

Điền vào số 4

A. maximum

B. excess

C. extremity

D. limit

Sugar tastes sweet because of thousands of receptors on the tongue which connect the substance with the brain. The taste of sweetness is universally accepted as the most pleasurable known, although it is a fructose. Abundant is the most common occurring sugar, (1)______ of which include fruit and honey. Sucrose, which supplies glucose to the body, is (2)______  from the sugar cane plant, and white sugar (pure sucrose) is used by food technologists to (3)______ sweetness in other substances. Approximately a dozen artificial sweeteners have been discovered; one of the earliest was Sorbitol from France.

Manufacturers add large amounts of sugar to foodstuffs but never more than the (4)______ required to produce the optimum pleasurable taste. Surprisingly, this amount is similar for different people and in different cultures. No one has (5)______ discovered a way to predict whether a substance will taste sweet, and it was by chance alone that all the man-made chemical sweeteners were found to be sweet.

Điền vào số 5

A. just

B. yet

C. still

D. already