Math practice for 13 year olds - page 280 of 420
Number of problems found: 8399
- Train speed
The troop fired two guns from the same place at 10 minutes and 30 seconds intervals, but a person on a train approaching the place heard a second shot 10 minutes after the first. The speed of the train (in km/hr), supposing that sound travels at 340 m/s, - Cube Edge from Volume
Find the length of the cube's edge and its volume is equal to 60% of the volume of a block measuring 7 cm, 8 cm, and 6 cm. - Probability of First Pie
Grandma used to cook sheep and cottage cheese pies together. There were 30 made from sheep cheese and 5 fewer made from cottage cheese. George took the first one and got 6 brownies and 3 curds. What is the probability that my first pie will not be bronze? - Isosceles Trapezoid Height
In the isosceles trapezoid ABCD, the base length is a = 10 cm, c = 6 cm, and the arm's length is 4 cm. Calculate its height—the result round to tenths. - TV Price After Discount
The plasma TV happened at Christmas. Case 738eur. After Christmas. The shop sold it out on holidays, and its price decreased by 12%. How much did the TV cost after the discount? - Prism lateral area
Calculate the lateral surface area of a pentagonal prism if the total surface area of the prism is 258 cm² and one base of the prism has an area of 64.6 cm². Express the result in cm² as a decimal number. - Non-bank loan
Mrs. Smetanová took a non-bank loan. The monthly fee is calculated using a basic fee. The basic fee of 60 Kč is each month multiplied by the number of months for which Mrs. Smetanová knows the money borrowed (1st month = 1 × 60 Kč, 2nd month = 2 × 60 Kč, - Yeast Cake Ingredients Sugar
Does the yeast cake contain milk, yeast, sugar, and flour in a ratio of 20:4:1:15. How much sugar do we need to make 160 kg of yeast? - Snack Preference Students Count
Of all schoolchildren, one-sixth prefers a pear for a snack, 3/4 of the rest has an apple, and the other five students like an orange for a snack. How many pupils are there? - Three Consecutive Integers Sum
Find three consecutive integers whose sum is -693. - Ladder Length Wall Distance
The ladder is 1.4 m from the wall and touches 3 m high. How long is the ladder? - Machine Parts Production
The machine produces 2520 parts in 1 hour. How many will they make in 33 minutes? - The alley
The alley was planted with 490 trees 6 meters away. How many trees would be planted if the distance was 7.5 m? - Wood harvesting
The harvested wood is bundled from the forest to a sawmill. The driver makes the journey four times a day, and the work takes him eight days. How often would he have to go daily to finish the job two days earlier? - Seven
Seven friends agreed to send everyone a holiday card. How many postcards were sent? - Cylinder in Cone Volume
A cylinder with a height equal to half the height of the cone is inscribed in the rotating cone. Find the volume ratio of both bodies. - A residential
A residential colony has a population of 5400, and 60 liters of water is required per person per day. The effective utilization of rainwater constructed a water reservoir measuring 48m × 27m × 25m to collect the rainwater. For how many days is the water i - Two discounts
The MP4 player cost 960 CZK, and the price was twice gradually reduced in the ratio of 4:3:3/2. How much did the player cost after the second discount? - Square measurements
Find the area and perimeter of a square whose diagonal is 10 cm. - Equilateral triangle
Calculate the area of an equilateral triangle with a perimeter of 72 cm.
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