Math practice for 13 year olds - page 152 of 428
Number of problems found: 8558
- There
There is 5 l of water with a temperature of 20°C in the bucket. We add 3 liters of hot water. The resulting temperature will be 30°C. What was the temperature of the hot water? - Last month
Last month, Lana sold 35 necklaces a week at $15 each. However, six customers returned their necklaces throughout the month for a full refund due to defective clasps. How much did Lana make selling necklaces last month? (Hint: Assume there were four weeks - Bucket blueberry filling
Mirka picks up a bucket of blueberries in two hours. Lorenzo fills one-third of the bucket every hour. How long would it take to fill one bucket together to the brim? - Wall paint proportional
Matthew paints his room. He paints square walls. He painted a wall with a side of 3 m and consumed 5 kg of paint. How many kilograms of paint will he need on a wall with a side length of 6 m? - Part-timers
Six part-timers would take seven hours to pick strawberries. How long would this work take if two more temporary workers were added after three hours? - Four-times of an age
Karel's age is two-fifths the age of his older brother Michal. Two years ago, Karel was four times younger than Michal. How old is Karel now? - Rectangular land
Due to the new road, the longer dimension of the rectangular plot had to be shortened by 4 percent, and the shorter dimension shrunk by 10 percent. Thus, the area of the land has decreased by how much percent? - Feed to hay
How many tons of water do we have to dehydrate from 8 tons of feed if the original moisture is 54 percent to get hay with a moisture content of 15 percent? Round to two decimal places. - Length of the chord
Calculate the length of the chord in a circle with a radius of 25 cm and a central angle of 26°. - A rectangle 5
A rectangle has sides of 10 cm and 14 cm. Calculate the angle between a diagonal and a long side. - The conical roof
The conical roof above the warehouse has a diameter of the lower part (base) d = 11.2 m and a height v = 3.3 m. How many rectangular steel plates with dimensions of 1.4 m and 0.9 m were needed to produce this roof if the seams and waste required an increa - Pocket money debt
Marek had 325 CZK. He bought a T-shirt for 129 CZK and wanted to spend 276 CZK on fishing supplies. How many CZK did his parents add to his fishing gear? How many weeks did they cut his pocket money by CZK 10 before he paid off the debt? - Yogurt plan exceeded
The dairy produced 2,800 pieces of yogurt instead of 2000. By what percentage did it exceed the plan? - Student sibling percentage
There are 30 students in the class. 70% of them have one sibling. How many students have one sibling? - Car repair parts
Car repair costs CZK 8,400. The owner paid 36% for the work and gave the rest for new parts. How much did he give for new parts? - Book price
The book was increased by CZK 20% from CZK 350. The bookseller subsequently reduced it by 15% as it did not go on sale. What was its final price? - Club boy girl There were 43 pupils in the school club, seven fewer boys than the girls. How many boys and girls were in the club?
- Volunteer hours average
During the cross-country ski run modifications, 32 volunteers worked 256 hours. How many hours did an average volunteer work? - Wire bundle weight
How many meters of wire is in a bundle of 900 g if 10 meters of wire weighs 150 g? - Paper cutting
Susanna is cutting construction paper into rectangles for a project. She needs to cut one rectangle 10 inches × 14 1/2 inches. She needs to cut another rectangle 10 1/3 inches by 10 1/2 inches. How many total square inches of construction paper does Susan
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