Maths practice for 13 year olds - page 245 of 341
Number of problems found: 6814
- Substitution 4644
Solve the system of equations by substitution, comparison, and addition method and perform the test: 4x + y = 5 3x-5y = 21 - Decimal 4641
The sum of two decimal numbers, one of the numbers is 3.2, larger than the other, is 52.78. - Cost reduction
Two MP3 players whose price was equal to initially have been discounted, the first by 20%, the second by 35%. The difference in their prices of 750 CZK was after the price reduction. What was the original price of each of the two players? - Comparing salaries
Spouses compared salaries. Mrs. Janka found a 20% higher salary than Mr. Jaroslav. Together they earned € 1,430. How much do they earn each of them? - Seagull
An artificially created island in the shape of a circle with a radius of 50 m is overgrown with grass. The only exception is a landing area for helicopters in the shape of a rectangle measuring 15 m and 8 m. What is the probability that the flying seagull - Working together on project
Two employees did working on the project. First, make it alone for 20 days, the second for 24 days. How many days will it take to complete the project if five days they work together, then first will take two days holiday, and after returning they complet - Rectangular 4624
The lengths of the sides of the rectangular garden are in the ratio of 1:2. The junction of the centers of adjacent sides is 20 m long. Calculate the perimeter and acreage of the land. - Discounted 4623
The difference in prices for MP3 players was CZK 750. The shop discounted the MP3 player by 20%. The second MP3 was discounted by 35%, and after the discount, the difference in their prices was CZK 750. How much did they face before the deal? - Percentage 4619
Concert tickets have risen in price from € 18 to € 24. What percentage did they increase in price? - Three-quarters 4613
Matej deposits k euros in the bank per month. After each year, the bank credits him with three-quarters of the monthly deposit. How many euros will Matěj have in his account after a / year, b / y years? - Failure
Drivers of passenger cars have calculated that at a speed of 60 km/h arrives at their destination within 40 minutes. After 20 km, refrain for five minutes due to a technical failure. How fast must it go the rest of the way to the finish come at the schedu - Airports 4605
Regular planes fly between the two airports 690 km away. The aircraft takes off from the first airport at 6:30 am at an average speed of 60 km/h faster than the aircraft taking off at 7.00 am from the second airport. The planes always meet at 9.00 am. At - Kilometers 4604
The tourist traveled 78 km in three hours. For part of the journey, he traveled by bus at an average speed of 30 km/h, and for the rest, he walked at an average speed of 6 km/h. How long did he walk, and how many kilometers did he walk? - Doubravka 4593
Eva will mow the garden in 4 hours, and Doubravka will cut it in 3 hours. How long would it take to mow the garden if Eva started an hour earlier and only Doubravka joined it? - Z7-I-4 stars 4949
Write instead of stars digits, so the next write of the product of the two numbers is valid: ∗ ∗ ∗ · ∗ ∗ ∗ ∗ ∗ ∗ ∗ 4 9 4 9 ∗ ∗ ∗ ∗ ∗ ∗ 4 ∗ ∗ - The rope
A 68-centimeter-long rope is used to make a rhombus on the ground. The distance between a pair of opposite side corners is 16 centimeters. What is the distance between the other two corners? - Surface 4588
What is the volume of a sphere with a surface area of 113.04 square meters? - Calculate 4582
Calculate the surface of a sphere whose volume is 33.9 cm cubic. - Calculate 4580
Calculate the surface and volume of the sphere if the diameter d = 6.5dm - Prescribed 4579
The racing ball for men has a prescribed weight of 7250g. It is made of iron. How does its diameter change if we make it from lead? The density of iron is 7.8 g / cm cubic, and the density of lead is 11.3 t / m cubic.
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