Math practice for 13 year olds - page 318 of 434
Number of problems found: 8665
- 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, they arrive 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 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? - Scale factor
A prism with a volume of 1458 mm³ is scaled down to a volume of 16 mm³. What is the scale factor in fraction form? - 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. - Procedure 4578
I have to construct a triangle - procedure and solution side a = 7cm angle β = 40 median to side c: tc = 5cm
- Everyone 4572
Two workers completed the work in 12 days. If the other worked ten days longer than the first, how long would everyone work alone? - Strawberries 4564
Ten temporary workers collect 50 kg of strawberries per day. How many kilograms of strawberries do seven temporary workers collect per day? - Percentage 4563
How many out of 40 women are satisfied? What is the percentage? - Dimensions of the frame
The picture frame is made of a 6 cm wide bar. The dimensions of the image are 74 and 57 cm. Are the inner and outer edges of the frame two similar baffles? - Coach
The average age of 24 players and a coach of one team is 24 years. The average age of players without a coach is 23 years. How old is the coach?
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