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.