Arithmetic - problems
- Game 27
Susan wanted to play the game. In the beginning, the first says a number from 1 to 8. Then the second player adds a number from 1 to 5 and tells the sum. Again, the Susan adds a number from 1-5 and say sum and etc. . . The winner must say the number 27. Wh
- Three points
Three points A (-3;-5) B (9;-10) and C (2;k) . AB=AC What is value of k?
- Cube surface and volume
Find the surface of the cube with a volume of 27 dm3.
- A koala
A koala lives to be 14 years old in the wild. How much longer will a 2 year old koala probably live?
- Soup from canteen
For how many people is 90 liters of soup enough if we assume 3/8 liter of soup per person in the canteen?
- The third
The third rod is blue, half of the rod is red, the rest of the rod is white and measures 8 cm. How long is the whole rod?
- Powers 3
2 to the power of n divided by 4 to the power of -3 equal 4. What is the vaule of n?
The first generation of micro-organisms has a population of 13500 members. Each next generation is 11/10 times the previous one. Find out how many generations will reach at least three times members of the first generation.
- Watching TV
One evening 2/3 students watch TV. Of those students, 3/8 watched a reality show. Of the students that watched the show, 1/4 of them recorded it. What fraction of the students watched and recorded reality tv.
There are 28 bunches, and son ate 1/2, dad ate four bunches. How many of them remain on the baking dishes?
- Cake 7
1/3 of a cake shared with 4 people. What share of the whole cake has each people?
- Boys and girls
There are eight boys and nine girls in the class. There were six children on the trip from this class. What is the probability that left a) only boys b) just two boys
- Car crash
On the road, with a maximum permitted speed of 60 km/h, there was a car crash. From the length of the vehicle's braking distance, which was 40 m, the police investigated whether the driver did not exceed that speed. What is the conclusion of the police, as
- Two numbers 7
The sum of two consecutive even numbers is 30. Find the numbers.
- AP RT triangle
The length of the sides of a right triangle form an arithmetic progression, longer leg is 24 cm long. What are the perimeter and area?
- KLMN trapezoid
In the KLMN trapeze, KL has a 40 cm base and an MN of 16 cm. Point P lies on the KL line so that the NP segment divides the trapezoid into two parts with the same area. Find the length of the KP line.
- On the trip
On the trip were more than 55 children, but less than 65 children. Groups of 7 could be formed, but groups of 8 no. How many children were on a trip?
- The quotient
The quotient of g and 55 is the same as 279. What is g?
- Two thirds
Find two-thirds of the number equal to two-thirds of 99
- Clock's gears
In the clock machine, three gears fit together. The largest has 168 teeth, the middle 90 teeth, and the smallest 48 teeth. The middle wheel turns around its axis in 90 seconds. How many times during the day do all the gears meet in the starting position?