Một xe ô tô đi từ A đến B. Sau khi đi được một nửa quãng đường AB, người lái xe đã tăng vận tốc thêm 25% vận tốc ban đầu nên đã đến B sớm hơn 15 phút. Tính thời gian ô tô đã đi từ A đến B ?

Một người đi từ A đến B với vận tốc 40km/giờ. Đi được nửa đường, người đó dừng lại chữa xe trong 30 phút, nên để đến B đúng hẹn người đó đi tiếp với vận tốc 50km/giờ. Tính quãng đường AB ?

Một ô tô đi từ A đến B với vận tốc 30km/giờ. Lúc về sau khi đi được $\frac{1}{3}$ quãng đường với vận tốc cũ, xe dừng lại chữa 40 phút, do đó muốn thời gian về bằng thời gian đi, ô tô đã đi với vận tốc 36km/giờ. Tính quãng đường AB ?

Một ô tô đi từ A đến B. Người lái xe thấy rằng nếu xe đi với vận tốc 45km/giờ thì đến B sau giờ hẹn là 10 phút, còn nếu xe đi với vận tốc 55km/giờ thì đến B trước giờ hẹn 6 phút. Tính quãng đường AB ?

A hostel has 22 rooms to accommodate 124 students. 4 students can stay in a small room. A big room can accommodate 7 students. How many small rooms are there in the hostel ?

A test consists of 50 questions. Each question carries 2 marks. 1 mark is deducted for every wrong answer. Howard scores 85 in this test. How many questions does he answer correctly ?

A single-trip ticket costs 12 dollars. A two-way ticket for the same trip costs 18 dollars. Mr Frost pays 114 dollars in all for 8 tickets. Find the number of two-day tickets that he guys.

A small boat can carry 4 students. A big boat can carry 6 students. A teacher hires 11 boats to carry 52 students for a river excursion. How many big boats are there ?

A bus ticket to Town A cost 25 dollars. A bus ticket to Town B cost 36 dollars. Angeline paid 555 dollars in total for 20 such bus tickets. How many of these bus tickets were to Town A ?

There are 60 cars and trucks in a car park. They have a total of 312 wheels. How many trucks are there if each truck has 6 wheels ?

A farmer has 100 rabbits and chickens. The animals have 320 legs altogether. How many rabbits are there ?

A quiz consists of 15 questions. 8 marks are awarded for each correct answer. 4 marks are deducted if the answer is wrong. Melanie scores 84 marks in the quiz. How many questions has she answered wrongly ?

100 game cards are given to 16 children. Some of the children receive 4 game cards each while the rest receive 8 game cards each. How many children have received 4 game cards ?

Mrs Hana paid for 30 seven-dollar and five-dollar movie tickets with 200 dollars. She was given a change of 14 dollars. How many seven-dollar movie tickets did she buy ?

A class has twice as many girls as boys. The average weight of the girls is 26 kg. The average weight of the boys is 32 kg. What is the average weight of the students in the class ?

24 different 4-digit numbers can be formed using the digits 2, 3, 4, 7.  What is the average of the 24 numbers ?

A circular track measures 400 m. Amy runs the first round at the speed of 100m per minute. She then runs the second round at the speed of 80 m per minute. What is the average speed for the two rounds ?

Michael was sick on the day of the final examination for mathematics. The average score of the rest of the students in the class was 94 marks. Michael scored 65 marks for the make-up examination. The class average then became 93. How many students were there in the class ?

Aureila’s average score for her Mathematics test was 90 at first. She scored 100 for the final test. Her average score for the final test. Her average score for the tests became 92. How many tests had she sat for altogether ?

Jonathan scored 96 for English and 88 for science. What would be his score for mathematics if the average score for the three subjects was 93 ?

The Mathematic Olympiad Club in the school has 108  members. What are the average class sizes if the members are divided into 3 classes and 6 classes respectively ?

Rita scored an average of 90 marks in three tests. She then took another test and the average score of all the four tests became 92. How many marks did she score in the fourth test ?

A, B and C are three different numbers. The average of A, B and C is 40. When A is changed to 50, the average becomes 50. What is the original value of A ?

Calvin scores 92, 93, 94 and 97 marks for English, Science, Chinese and Mathematics respectively in the first semestral assessment. What is Calvin’s average marks for these four subjects ?

Two trains start their journeys from the same station but in the opposite direction. How far apart are the two trains right after 5 hours if one travels at 60 kilometres per hour and the other travels at 70 kilometres per hour ?