# Examples for 6th grade (the sixth graders) - page 19

- Brackets

Place one pair of brackets in expression 20-16 + 10 - 4 - 2 so that the result will be 0. - Motor oil

30 liters of oil cost 28.80 Euros. How much cost a liter? - Ratio - rectangle

The rectangle has dimensions 6 cm and 9 cm. How many times increases area and its perimeter, when its dimensions increase in the ratio 5:3? - Pencils

Emil has 23 pencils in a pencil case, 18 of which were broken. Emily 9 trims, 2 breaks, 4 trims and goes to school. When he return from school, he has broken 5 pencils. How many pencils have trimed at school? - Buses

Buses Ikarus and Karosa simultaneously started at 8:00 from the final station. Ikarus is returned to the station after 30 minutes. Karosa after 45 minutes. At what time both buses again returned to the station? - Pool 3

How long will fill pool cuboid shape (8m 6m 1.5m) when flows 15 liters/s? - Rings groups

27 pupils attend some group; dance group attends 14 pupils, 21 pupils sporty group and dramatic group 16 pupils. Dance and sporting attend 9 pupils, dance and drama 6 pupil, sporty and dramatic 11 pupils. How many pupils attend all three groups? - Plums

In the bag was to total 136 plums. Igor took 3 plums and Mary took 4/7 from the rest. How many plums remained in the bag? - Divisibility 2

How many divisors has integer number 13? - Colors

Willie got birthday 6 colour pens in different colors. How many ways he can give them side by side in pencil? - RWY

Calculate the opposite direction of the runway 13. Runways are named by a number between 01 and 36, which is generally one tenth of the azimuth of the runway's heading in degrees: a runway numbered 09 points east (90°), runway 18 is south (180°), runway. - Jumps

At least how many jumps must do frog to overcome the distance of 7 meters? Jump of frog is 18 cm long. - Students

The class has 22 students. 2 of which has assesement of 2. Count of assesement of 1 is three times more than count of students with assesement of 3. How many students has assesement of 1 and how many students has assesement of 1. - Speeds

George pass on the way to school distance 200 meters in 165 seconds. What is the average walking speed in m/s and km/h? - Soup

47% of pupils at the school to eat in the canteen, 1/47 of students who eat in the canteen eat lunch soup. a) What percentage of pupils who eat in the canteen and eat soup for lunch? b) What percentage of all pupils of school eat lunch soup? - Yogurt

The board is 35 yogurts. How many boards of yogurts must be ordered for 886 people in the canteen? - Cooks

Four cooks cleaned 5 kg of potatoes for 10 minutes. How many cook would have to work clean 9 kg of potatoes for 12 minutes? - Fire tank

How deep is the fire tank with the dimensions of the bottom 7m and 12m, when filled with 420 m^{3}of water? - Cuboid

How many times will increase the volume of a cuboid, if one dimension is twice larger, second dimension three times larger and third dimension four times lower? - Midpoints

Triangle whose sides are midpoints of sides of triangle ABC has a perimeter 45. How long is perimeter of triangle ABC?

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