Math practice for 13 year olds - page 241 of 413

Number of problems found: 8260

Drain Holes Reduction
I will drain the whole tub in 4 minutes. How long would it take to drain it if I added two more drain holes?
Hot Water Consumption Reduction
The survey reduced hot water consumption by a ratio of 4:5. By what percentage has household water consumption decreased?
Machine Price Without Tax
The company paid a 20% tax on the purchase of the machine in the amount of 240 €. What is the price of the machine without tax?
Workers Days Hop Garden
Twenty-four combers combed the hop garden in 6.5 days. How many combers would have to work on combing the hop garden in 5 days?
TV Price Changes Series
The TV cost 1000 euros. In the last three months, they first reduced the TV price by 30%, then lowered it again by 20%, and finally increased it by 50%. Was the last price the same as the original?
Two cars on ring
Two cars were on the round track (ring) in the adjacent tracks, the first on the inner track and the second on the outer track. Both cars started at the same time from one starting track. The first toy car drove four laps simultaneously, and the second to
A transmitter tower
A transmitter tower is 80 metres high and is secured to the ground by 4 steel cables, each anchored 60 metres from the base of the tower. Calculate how many metres of steel cable were needed in total to secure the transmitter tower. The steel cable has a
Body surfaces
The cuboid's volume is 864 mm³. Its square base has the same area as the base of a quadrilateral prism, with dimensions 7 cm and 9 cm, the height of the base 4 cm, and the height of the prism 15 cm. Find the surfaces of both bodies.
Luggage and air travel
Two friends traveling by plane had a total of 35 kg of luggage. They paid one 72 CZK and the second 108 CZK for being overweight. If only one paid for all the bags, it would cost 300 CZK. What weight of baggage did each of them have? How many kilograms of
Sum and ratio
The sum and the ratio of two numbers are both equal to 10. What are the two numbers?
Dividing Money Given Ratio
The company paid three employees 50 euros, 100 euros, and 60 euros. They are to receive a total of 735 euros for further work. How will they divide this amount if it is divided in the ratio as in the first case?
Midpoint 5
FM=3x-4, MG=5x-26, FG=? Point M is the midpoint of FG. Use the given information to find the unknown measure or value.
3rd dimension
The block has a surface of 42 dm², and its dimensions are 3 dm and 2 dm. What is the third dimension?
Watering can
A watering can full of water weighs 11 kg. The weight of water is 10 kg greater than the weight of an empty watering can. How much is the weight of the watering can?
Eight hours
Brigadier Franta ties a sheaf of hay in 20 minutes. Lujza, at the same time, only a quarter. How many sheaves will they tie together in 8 hours?
Rectangle Square Area Difference
In the given rectangle, the length is 12 m greater than the width. We get a square if we reduce the length by 10 m and increase the width by 2 m. The area of the original rectangle is 300 m² more than the area of the square. Determine the dimensions of th
Horizontal distance
The road has a gradient of 8%. How many meters will it rise over a horizontal distance of 400 m?
Tables
The ninth-grade students are on a day trip. In the morning, the group had refreshments at a sweet shop. They sat at tables in groups of three and filled all the seats. At lunch, they sat at tables in groups of four and again filled all the seats. There we
Pile of sand
A large pile of sand has been dumped into a conical pile in a warehouse. The slant height of the pile is 20 feet. The diameter of the base of the sandpile is 31 feet. Find the volume of the pile of sand.
Lumberjacks
Fifteen lumberjacks would take 12 days to destroy the broken trees. How many days would this work require if the company added five workers to it after four days?

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