Maths practice for 14 year olds - page 216 of 361

Number of problems found: 7217

Average Age Fifth Person
The company of five people has an average age of 46 years. The average age of the first four of them is 43 years. How old is the fifth one?
Octagonal tank
The tank has the shape of a regular octagonal prism without an upper base. The base edge has a = 3 m, and the side edge b = 6 m. How much metal sheet is needed to build the tank? Do not think about losses or sheet thickness.
Pupils
There are 32 pupils in the classroom, and there are two-thirds more girls than boys. a) How many percent are more girls than boys? Round the result to a whole percentage. b) How many boys are in the class? c) Find the ratio of boys and girls in the class.
Employees
1116 people are working in three factory halls. In the first one, 18% more than the third, and 60 persons more than the second. How many employees work in individual halls?
KLMN trapezoid
The KLMN trapezoid has bases KL 40 cm and MN 16 cm. On the KL base is point P. The segment NP divides the trapezoid into units with the same area. What is the distance of point P from point K?
Isosceles Trapezoid Arm Length
Diagonal alpha equals 0.4 m, and diagonal beta equals 0.4 m in the isosceles trapezoid. Side AB is 120 cm, and side DC is 7.6 dm. Find the length of arms in an isosceles trapezoid. Please result round to 2 decimal places.
Two pumps together
The first pump will fill the tank itself in 3 hours and the second one in 6 hours. How many hours will the tank be full if both pumps are worked simultaneously?
Land
A rectangular, triangular piece of land has an area of 30 square meters and a 12 meter-long leg. How many meters of fence do you need to fence this piece of land?
Repairing
Three employees earned a total of € 469 for repairing the equipment. They split the money so that the first got 20% more than the second and the third 15% more than the second. Thus, everyone got a total of € 469.
Math test
Obelix filled out a mathematical test in which he answered 25 questions. For every correct answer, he received 5 points. For each wrong answer, he had 3 points deducted. Obelix gained 36% of all points in the test. How many questions did he solve correctl
Non-skiers
All fifth-graders went together on a ski course. There were more than 30 but fewer than 40 of them. First they were divided into skiers and non-skiers. Half of all the girls ended up in the non-skiers group, along with the same number of boys. In the skie
The Hotel
The Holiday Hotel has the same number of rooms on each floor. Rooms are numbered with natural numerals sequentially from the first floor; no number is omitted, and each room has a different number. Three tourists arrived at the hotel. The first one was in
Three Day Hike Distances
Pupils walked a total of 30 km during the three-day trip. On the first day, they ran twice as much as on the third day, and on the second day, they ran 6 km more than on the third day. How many km have they traveled each day?
Find diagonal
Find the diagonal length of a cuboid with length=20 m, width=25 m, and height=150 m.
Final exam
There are five learners in a class who wrote a final exam. Aleta scored 55%, Vera scored 36%, and Sibusiso scored 88%. Thoko scored 71%, and the class average was 63%. What was David's score as a percentage?
The volume 2
The volume of a cube is 27 cubic meters. Find the height of the cube.
Mini-survey
In our class's mini-survey about the popularity of individual subjects, it turned out that 11.1% of pupils like mathematics, 18.5% enjoy languages, 30.4% like physical education, and the remaining 12 pupils have several popular subjects. How many students
Cube diagonals
Calculate the length of the side and the diagonals of the cube with a volume of 27 cm³.
On a farm
A farm has 900 rabbits, 700 sheep, 300 cattle, and 500 pigs. What percentage of the total number of animals are rabbits?
Two friends
Peter can do all his work himself in 6 hours, while Martin can do the same work himself in 8 hours. Peter worked first and was then replaced by Martin, so the whole work was done in 6.5 hours. Calculate how long Peter worked before being replaced by Marti

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