Math practice for 13 year olds - page 333 of 413
Number of problems found: 8260
- Three angles
In a triangle ABC, the magnitude of the internal angle gamma is equal to one-third of the angle alpha. The size of the angle beta is 80 degrees larger than the size of the gamma angle. Calculate the magnitudes of the interior angles of the triangle ABC. - Workers needed
The broad workers will do the job in 22.5 days. How many workers still need to be hired to do the job seven days earlier? - Tile colors
The rectangle 1 m and 40 cm long and 1 m and 20 cm wide is paved with square tiles with a side of 1 dm. There is one row of brown tiles on all edges of the rectangle, white on the inside. How many brown and how many white tiles? - Pullover price
The pullover originally cost 45 euros. First, it fell by 20% and then by 10%. What is its current price? - Painters
Five painters painted the fence for eight days. How many days over will it take to work if they paint the fence with only four decorators? - Candies
The price for 1 kg of more expensive candies is 125 CZK. The price for 1 kg of cheaper candy is 100 CZK. We mix two different mixtures of candy. A) The first mixture contains 2 kg more expensive and 0.5 kg cheaper candy. Calculate the price for 1 kg of th - Rowing adolescents
The rowing club has 90 members. Four times as many older adolescents are in the section as younger adolescents. On the other hand, 54 fewer younger adolescents are in the section than older adolescents. How many older and younger adolescents are there? - Magic number
The number 135 split into two addends so that one addend was 30 greater than 2/5 the addend. - Fifteen
Fifteen students had an average age of 12 years. When the class teacher came to see them, their average increased by exactly one year. How old was the teacher? - Brief probability
I have three colors of briefs. White, black, and red. What is the probability that I will choose white briefs? - Graders count
Seventh-, eighth-, and ninth-graders were sitting in the cinema hall, 250 pupils in total. There were 30 more seventh-graders than eighth-graders, and 10 fewer eighth-graders than ninth-graders. Determine how many pupils of each grade there were. - Molding distribution
There are 2,600 moldings in stock. They are to be divided into 3 workshops so that in hall 1, there are 400 moldings less than in hall 2, and in hall 2, there are 300 moldings more than in the third hall. How many moldings are delivered to individual hall - Rest breaks
The tourist ride lasted 6 hours. The tourists had three 15-minute and four 10-minute rest breaks during the tour. What % of the total walking time broke? Calculate two-tenths of a place - Floor cleaning
Nine cleaners clean 3150 m² of the floor in 7 days. Determine how many m² of floor eight cleaners will clean in 9 days. - Porridge fiber
One serving of breakfast porridge weighs 175 g. According to its nutritional information, it contains 75 g of fiber. What percentage of fiber is in this porridge? - Race stages
In the three-stage races, which totaled 550 km, cyclists drove 38% in the first and 27% in the second stages. How many km will they cover in the third stage? - Number identification
The sum of the two numbers is 110. The first number is 900% of the second number. Identify both of these numbers. - Apples in baskets
We have eight baskets. The first basket contains four apples, and the next basket contains 29 more apples than the previous one. Find the number of apples in each basket. - Pears
Andrew, Helen, and Ralph have 232 pears in total. Helen has 28 more than Ralph, and Ralph has 96 more than Andrew. Determine how many pears each of them has. - Students
Three students sit in the front row, and 11 students sit in every other row, more than in the previous row. Determine how many students are in the room when the room is nine lines and how many students are in the seventh row.
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