Popular math problems - last page
- Percentages above 100%
What is 144% of 65? What is the meaning of percentages above 100%?
- Workers
Two workers would 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 the second worker do the whole job?
- Tetrahedral pyramid
What is the surface of a regular tetrahedral (four-sided) pyramid if the base edge a=16 and height v=16?
- Medicament
Many manufacturers produce the same type of medicament in various packages with different content of active substances. Pack 1: includes 60 pills of 600 mg of active substance per pack cost 31.5 Eur. Pack 2: includes 100 tablets of 1200 mg of active subst
- Football league
In the 5th football league is 10 teams. How many ways can be filled first, second and third place?
- Greenhouses
Two workers would make installation of greenhouses for 54 hours. For how many hours does the installation have nine workers?
- Children in the classroom
How many children are in the classroom, where Ladislav is 10th lightest and 16th heaviest in class?
- Forestry workers
56 laborers have employed planted trees in the forest. For 8 hour work, a 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 work 10 hours a day?
- Shelf
How many ways are there to arrange 6 books on a shelf?
- Cube
Calculate the surface cube with edge 11 dm.
- Scrap
From 19 products are 4 scraps. What is the probability that the random pick of 2 products has no defective product?
- Balls
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?
- Beer
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?
- Chocolates
In the market, we have 3 kinds of chocolates. How many ways can we buy 8 chocolates?
- Rabbits
In the hutch are 48 mottled rabbits. Brown is 23 less than mottled, and white is 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 the same road 37 workers if they work 8 per day?
- CDs
Adam has 6 CDs more than Filip and 7 CDs less than Dominica. Filip has 6 CDs. How many CDs have Adam, and how many CDs has Dominika?
- Cats
Two cats caught two mice in two days. How many mouses will catch 6 cats for 6 days?
- Excavation
Mr. Vendelín calculated that excavation for a water connection digs for 10 days. His friend would take 10 days. Vendelín worked 3 days alone. Then his friend came to help and started on the other end. On what day since the beginning of the excavation they
- Candy
How many ways can divide 10 identical candies to 5 children?
Do you have homework that you need help solving? Ask a question, and we will try to solve it.