Math practice for 13 year olds - page 330 of 422

Number of problems found: 8430

Remuneration
Total remuneration for workers is 47,000 CZK. The second worker received 20% more than the first and the third 4000 CZK less than the second employee. How many CZK does each receive?
Jane class
When asked how many students were in class, Jane said, "If we increase the number of students in our class by 100% and then add half the number of students, we get 100." How many students are in Jane's class?
Factory
In the factory, workers work in three shifts. Half of all employees work on the first shift, a third on the second shift, and on the third shift 200 employees. How many employees work at the factory?
Eight palm
There grow eight palms by the sea. At the first sitting, one parrot, on the second two, on the third sits four parrots on each other, twice the previous parrots sitting on a previous palm. How many parrots are sitting on the eighth palm?
Boxes
Two hundred boxes have been straightened in three rows. The first row was 13 more than in the second, and the second was one-fifth more than in the third. How many boxes are in each row?
Fe vs. H2O
For the same weight, which body has a greater volume: iron or water?
Percentages
Calculate the percentages to two decimal places: a / 15 min in 4 hours B / 35 cm² of 12.5 dm² c / 2dm² of 400 cm² D / 0.2 liters from 2.2 liters
The field
The player crossed the field diagonally and covered a distance of 250 m. Calculate the perimeter of the field if one side of the field is 25 meters.
Blueberries 2
Helen and Martin collected eight liters of blueberries in two hours. How long will Helen take to collect the blueberries alone if we know that she takes 2.5 hours less than Martin?
Circle's chords
The circle has two chord lengths, 30 and 34 cm. The shorter chord is twice as far from the center as the longer one. Determine the radius of the circle.
PC disks
Peter has 45 disks in three colors. One-fifth of the disks are blue; red is twice more than white. How many blue, red, and white disks are there?
Sweets
We want to prepare 5 kg of sweets for 150 CZK. We will mix cheaper candy: 1 kg for 120 CZK and more expensive candy: 1 kg per 240 CZK. How many of these two candy types are necessary to prepare this mixture?
Sum of three numbers
The sum of three numbers from which the second number is 20% smaller than the first number and the third number is 25% smaller than the second number is 96. Determine these numbers.
ATC camp
The owner of the campsite offers 79 places in 22 cabins. How many of them are triple and quadruple?
Tour
Thirty-five people went on a tour and paid 8530. Employees pay 165, and family members pay 310. How many employees and how many family members went on the tour?
Schools
Six hundred seventy-eight pupils attend three schools. The first had 21 students, and the third had 108 fewer students than the second school. How many students attend the schools?
Summerjob
Three students participated in the summer job. Together, they earned 1780, -. Peter got a third less than John, and Paul got 100 more than Peter. How much did each one of them cost?
UN 1
If we add one quarter of an unknown number to itself, we get 210. Find the unknown number.
Resistance
Determine the bulb's resistance with the current 200 mA and is in a regular lamp (230 V).
Sides of triangle
A triangle has a perimeter of 42 cm. Side a is half the length of side b, and side c is 2 cm longer than side a. Find the lengths of the sides of a triangle.

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