Math practice for 13 year olds - page 134 of 428

Number of problems found: 8555

Direct proportion
y varies directly as x and y=32 when x=4. Find the constant of variation.
Three men
If three men can do a job in 8 days, how many men can do the same job in 6 days?
Three dices
What is the probability that the sum of points 14 will be a roll of three dice (B, M, Z)?
Iced tea bottle
Iced tea in a bottle costs 1.20 euros. A bottle is seven times cheaper than tea. How many euros does a bottle cost, and how much tea?
How long
How long is the diagonal of the square with side a = 50mm?
Grass mix bag
The gardener has to prepare a grass mix containing clover grass and a meadow mixture at a price of CZK 24 per kilogram. A kilogram of mono-grass mixture costs CZK 22, and a kilogram of meadow mixture costs CZK 30. It will determine how many kilograms of m
Tea mixture package
1 kg of white tea costs CZK 1,800. 1 kg of green tea costs CZK 1,200. It determines how many grams of white and green tea will be contained in a package of Buddha's mixture if it weighs 50g and costs CZK 65.
Three cottages
141 guests are accommodated in 3 cottages. In the second cottage, there are eight more guests than in the first cottage, and in the third cottage, there are 14 more guests than in the second cottage. Find out how many guests are staying in the first cotta
A cone
A cone measures 6 inches in diameter at the base. The distance from the edge of the circumference to the top is 12 inches. Find its volume.
Equilateral cylinder
Find the radius and height (in centimeters) of an equilateral cylinder with a volume of 1 liter.
An equilateral cone
Determine the radius and height (in centimeters) of an equilateral cone that has a volume of 1 liter.
A rectangular 5
A rectangular picture frame is made of wooden strips ¾ inch wide. The outside edge of the frame is 8 ¼ inches long and 6 ¾ inches wide. Can a rectangular picture 7 inches long and 5 ½ inches wide fit inside the frame? CLEARLY EXPLAIN your answer.
One-half
3 9/10 is the same as the sum of 3 1/3 and half of a number.
Find whole
Find whole numbers between 155 and 232 that are divisible by 2, 5, and 10.
Hat and scarf
Katy knitted a scarf four times faster than a hat. Knitting together lasted 15 days. How much did she knit a hat?
Door painting time
Peter and Milan painted the garage door in five hours. Peter would paint the door himself in 10 hours. In how many hours would Milan paint the door himself?
What is similar fraction
Which of the following is a similar fraction of 9/10,3/5,1/4
What fraction 2
What fraction is equal to 50% of 1/3?
The ratio 7
The ratio of the sides of two squares is 4:5. If the sum of their areas is 180 cm². Find the sides of the two squares.
What percent 4
What percent of 40 is 14?

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