# Unit conversion - 7th grade (12y) - math problems

#### Number of problems found: 447

- Biking

Dhea is biking for 20 mins every day before going to school. She looked at her watch and she already achieved 10 hours of biking. How many days in total did she achieve? - The classroom

The classroom is 9 meters long. The width of the classroom is smaller and can be passed in equally long steps of 55 CM or 70 CM. Determine the width of the classroom. - Clock mathematics

If it is now 7:38 pm, what time will it be in 30,033,996,480 minutes from now? - Quarter of an hour

If the clock showed a quarter of an hour more, it would be 10 minutes to 10 hours. How many hours do they show? - Volume per time

How long does fill take for a pump with a volume flow of 200 l per minute fill a cube-shaped tank up to 75% of its height if the length of the cube edge is 4 m? - Sand

How much m ^ 3 of sand can be loaded on a car with a load capacity of 5 t? The sand density is 1600 kg/m^{3}. - Bricks

How many bricks are needed for a wall 14.5 m long, 2 m high and 45 cm thick, if 285 bricks are needed for one m ^ 3 wall? - Nautical miles

How many nautical miles do they sail if the route is shown on a 1:25 000 scale map with a 7.4 cm long line? - Roof repair

To repair the roof, we need 15 pieces of boards 6 m long, 15 cm wide and 25 mm thick. How many euros will we pay for all boards if 1 m^{3}of boards costs 500 euros? - Coke and coal

20.1 tons of coke is produced from 30 tons of black coal. How much coke is made from 1 kilogram of coal? - Isosceles trapezoid

Find the area of an isosceles trapezoid with bases of 8cm and 72mm. The height of the trapezoid is equal to three-quarters of the longer base. - Aquarium

How many liters of water can fit in an aquarium measuring 30, 15 and 20 cm? - The body

The body has dimensions of 2m, 2dm, and 10 cm. It weighs 28 kg. What is its density? - Two villages

Two villages are 11 km and 500 m away. On the map, their distance is determined by a 5 cm long line. Find the scale of the map. - Brick wall

What is the weight of a solid brick wall that is 30 cm wide, 4 m long and 2 m high? The density of the brick is 1500 kg per cubic meter. - Thousand balls

We have to create a thousand balls from a sphere with a diameter of 1 m. What will be their radius? - Hectares

Determine the area of the rectangular land (in ha), which has dimensions of 3 cm and 4.5 cm on the plan with a scale of 1: 40,000. - Gears

The front gear on the bike has 32 teeth and the rear, on the wheel, has 12 teeth. How many times does the bike's rear-wheel turn if you turn the right pedal 30 times? What distance will you go if the circumference of the bicycle wheel is 250 cm? - A family

A family of four consumes 220 liters of water a day. How many hectoliters of water are consumed by 68 tenants per day? - Chimney and tree

Calculate the height of the factory chimney, which casts a shadow 6.5 m long in the afternoon. At the same time, a 6 m high tree standing near it casts a shadow 25 dm long.

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Unit conversion - math problems. Examples for 7th grade (seventh).