Basic functions + reason - practice problems - page 3 of 99
Number of problems found: 1975
- Copiers
Three copiers will do the same in an hour, k copies. How many copies would be done in an hour by four such copiers? ... - Painters
Fifteen painters painted the fence for 280 minutes. For how many minutes, paint half of this fence with 12 painters? - Minutes 80992
Three eggs are cooked in 15 minutes; how long will it take to cook 15 eggs at once? - Minutes 67614
If eight eggs are cooked in 10 minutes, how long will it take to cook 28 eggs?
- Big number
Dagmar typed numbers on the computer (without spaces) 45678910111213141516... Which number did she write in the third place? - Percentage 81801
Although the price of a theater ticket rose by 20 percent, sales rose by only 8 percent. By what percentage did the number of viewers have to drop? - Fuel consumption
Mazda car has an average nafty consumption of 4.2 liters per 100 kilometers. What is the car range for a full tank of volume 73 liters? - Extreme temperatures
The USA hit an extreme heat wave. Calculate the percentage of the air temperature change from normal summer temperature $t2 °C to $t1 °C. - Possible 4654
It's 2015, and I'm 35 years old. In 2017, I will be 36 years old. How is it possible?
- Organizers 45351
The ski organizers have to print the start numbers from 1 to 45. How many times do they use the number 3 when printing? - Shelter 5316
The sun rises east of the shelter and sets in the west. A goat would gather a little shade. Where and what kind of tree should be planted so that it does not bypass it? - White balls
I have three white balls and five red balls in my pocket. How many balls do I have to remove from the bag to ensure the pulled-out ball is red? - On a farm
A farm has 900 rabbits, 700 sheep, 300 cattle, and 500 pigs. What percentage of the total number of animals are rabbits? - Twenty-five 81187
Twenty-five prizes are drawn in a raffle with 500 tickets. How many tickets do we need to buy to ensure I win at least 3 prizes?
- New computer
The new computer process a certain amount of data for 6 hours. How many hours will process the same amount of data older computer with a quarter lower performance? - Remaining 5367
Zuzana read a 250-page book. On the first day, she read 20% of the book. On the second day, half of the remaining pages. How many pages of the book has it unread? - Cut trees
There are 1,200 trees in the grove, of which 55 percent are deciduous, the remaining coniferous. Workers cut down 35 percent of a) trees, b) deciduous trees, c) coniferous trees. How many trees now have this grove? - Barter
There is exchange trade on the market. We know that for two sheepskins, we get three goat skins. We also know that we get four goat skins for six rabbit skins. How many rabbit skins do we get for four sheepskins? - Defective 23221
The factory sets a standard that 2% of products may be defective. Last week, out of 1,250 products, 32 were defective. How many defective products were the standard exceeded?
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