The most viewed math problems
- Percentages above 100%
What is 122% of 185? What is the meaning of percentages above 100%?
Two workers fulfill a certain task when working together for 5 days, the first if he worked himself done work in 13 days. How many days will do whole job a second worker?
- Tetrahedral pyramid
What is the surface of a regular tetrahedral (four-sided) pyramid if the base edge a=16 and height v=16?
Same type of medicament produces a number of manufacturers in a variety of packages with different content of active substance. Pack 1: includes 60 pills of 600 mg of active substance per pack cost 9 Eur. Pack 2: includes 150 pills of 500 mg of active su
- Football league
In the 5th football league is 10 teams. How many ways can be filled first, second and third place?
Two workers would make installation of greenhouses for 54 hours. For how many hours does the installation 9 workers?
- Forestry workers
In the forest is employed 56 laborers planting trees in nurseries. For 8 hour work day would end job in 37 days. After 16 days, 9 laborers go forth? How many days are needed to complete planting trees in nurseries by others, if they will work 10 hours a
- Children in the classroom
How many children are in the classroom, where Ladislav is 10th lightest and 16th heaviest in class?
How many ways are there to arrange 6 books on a shelf?
From the urn in which are 7 white balls and 17 red, gradually drag 3-times without replacement. What is the probability that pulls balls are in order: red red red?
From 6 products are 3 scrap. What is the probability that the random pick of 2 products have no defective product?
Calculate the surface cube with edge 11 dm.
After three 10° beers consumed in a short time, there is 5.6 g of alcohol in 6 kg adult human blood. How much is it per mille?
In the hutch are 48 mottled rabbits. Brown are 23 less than mottled and white are 8-times less than mottled. How many rabbits are in the hutch?
- Road repair
Road repair took 10 days for 36 workers if they worked 9 hours a day. How many days take repair same road 37 workers if they work 8 per day?
In the market have 3 kinds of chocolates. How many ways can we buy 14 chocolates?
Mr. Billy calculated that excavation for a water connection dig for 12 days. His friend would take 10 days. Billy worked 3 days alone. Then his friend came to help and started on the other end. On what day since the beginning of excavation they met?
Adam has 6 CDs more than Filip and 7 CDs less than Dominica. Filip has 6 CDs. How many CDs has Adam and how many CDs has Dominika?
Two cats caught two mice in two days. How many mouses will catch 6 cats for 6 days?
How many ways can divide 10 identical candies to 5 children?