Math practice for 13 year olds - page 69 of 414
Number of problems found: 8262
- Amazon river length
The longest Brazilian river, the Amazon, is ten times longer than the two Czech rivers, Vltava and Berounka. The ratio of the lengths of the Vltava and Berounka is 9:5. At the same time, the length ratio of the Vltava and Morava rivers is 5:4. How many ki - Sailor food supply
Food for 56 sailors would last 32 days. How long did the food supplies last the expedition if 14 castaways were taken on board after 12 days of sailing? - Logger field clearing
Fifteen loggers would take 12 days to clear a large field. How many days did this work require, if 5 more woodcutters were transferred to them after 4 days of work? - Mason house addition
8 masons build a house in 630 days. How many masons must we add after 150 days to complete the whole house in 320 days? - Grinder workshop production
Five grinders grind 120 products in 12 hours. After 4 hours of work, another 11 grinders were reassigned to the workshop. Will he complete the entire job in 6 hours? - Seamstress order hours
Eight seamstresses sew an order in 85 hours. After 21 hours, 3 seamstresses had to leave for other work. In how many more hours will the order be fulfilled? How many hours did the whole job take? - Scout troop increase
Last year, there were 30 more boys than girls in our scout troop. This year, the number of children in the ward increased by 10%, while the number of boys increased by 5% and the number of girls increased by 20%. How many children do we have in the depart - Swimmer pool meeting
The pool is 50 m long. The first swimmer swims across it in the 60 s and the second in the 40 s. Both start at the same time and on the same side. The faster swimmer turns around at the end and swims back. When will he meet the slower swimmer? Swimmers mo - Cylinder - V,r,h
What is the volume of a cylinder with a radius of 11.3 cm and a height of 28 cm? - Die roll probability
If we roll one die, what is the probability of rolling a number other than 1? - Stamp purchase count
The company secretary bought stamps worth CZK 20 and CZK 15. The total number of purchased stamps is 120, and the secretary paid a total of 2265 CZK. How many stamps worth 15 CZK did she buy? - Train speed direction
Soňa is sitting on the train, looking out the window, and what she doesn't see is that the landscape runs backward at a constant speed of 160 km/h, and on the side track, the train is seemingly backing up at a constant speed of 40 km/h. Sonia stops and wo - Five-digit number creation
How many 5-digit numbers can we create from the number 1,2,3,4,5 if the one's place is to have the number 5? (digits must not be repeated.) - Thermal energy
From the formula for calculating thermal energy Q=m*c*t, express t and calculate by how many °C 2 kg of water must be heated to increase its energy by 126 kJ - Arithmetic mean relation
If the arithmetic mean of the numbers a1, a2, a3, a4, and a5 is the number A, the arithmetic mean of the numbers a1, a2, a3, and a4 is the number B, then what is a5 equal to? - Segment ratio reduction
If I reduce a segment of length 72 cm in a ratio of 5:8, it will have a length of x cm. Calculate x. - Base percentage forty
What is the basis if 40% of the base is €320? - Clock triangle angles
Calculate the sizes of the interior angles in the triangle whose vertices are the points marked by the numbers 1, 5, and 8 on the clock face. - Cooperatives - table
There are 3 agricultural cooperatives and one private farmer in the district. The table shows the wheat yields per hectare in t/ha and their areas in hectares for 4 entities. What was the average wheat yield in the district? Entity; Yield [t/ha]; Area [ha - Femur person height
The length of the femur makes up 27% of a person's height. If the femur is 46.75 cm long, how tall is a person?
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