Reasoning - math word problems - page 21 of 31

Number of problems found: 613

Library book increase
The number of books in the city library increased by 0.2% in 2008 and 0.6% in 2009. At the same time, the total number of books remained less than 300,000. How many books were added to the city library in 2009?
Book selection ways
Mary is required to read three books out of five designated books. In how many ways can she choose three books to read?
Banker client probability
The banker deals, on average, with five clients a day. Find the probability that the number of clients (in one day) will be greater than 4.
Cube face coloring
We painted a wooden cube with an edge 4 cm long with green paint over the entire surface. Then we cut it into small cubes with an edge length of 1 cm. The number of cubes that have precisely two faces colored green is:
Clock strike duration
The wall clock strikes every full hour, as many strikes as there are hours. The pauses between punches last as long as the punches themselves. At 6:00, exactly 22 seconds passed from the beginning of the first stroke to the end of the last stroke. How lon
Tree street spacing
Eleven trees are planted on the street at equal distances. If they planted three more trees, the spaces between them would be 12 m shorter. What is the distance in meters between the first and the last tree?
Fire extinguisher weight
During the fire extinguishing exercise, 40% of the foam was sprayed from the foam fire extinguisher. The entire device weighed 7 kg, and after training, it dropped to 4.6 kg. What was the weight of the empty device?
Dice color probability
In an opaque box, identical cubes of different colors: 15 are red, 8 are blue, and 7 are green. We successively drew 10 red, 4 blue, and 3 green dice. What is the probability that we draw a red die from the remaining dice in the next roll?
Gym age average
There are three times more children in the gym than adults. The average age of adults is 44 years. What is the average age of children if the total average age of everyone in the gym is 20?
Ticket selection ways
A pocket contains six tickets numbered 1 to 6. In how many ways can 3 tickets be drawn one by one, in order, without replacing the drawn tickets?
Son birth year
My only son was born when I was 37 years old. That was exactly 32 years after the death of my grandfather, and he died at the age of 64. Dedecek was 12 years older than Grandma; they got married in 1947, just when Grandma was 18 years old. What year was m
Peter sleep time
Peter slept 635 minutes. He woke up at 7:15 in the morning. What time did he go to bed?
Dolls
Dorotka cut the doll's way out of two batches. She was always left with one more doll, with every two dolls cut out. How many dolls did they cut in total if the number counted 16 of them in the first cut-out?
Digit deletion sum
Find the three digits that need to be deleted from 214568793 to make the number as small as possible. What is the sum of these deleted digits?
Film premiere
How can you distribute 40 cinema tickets to 15 people?
Hens and rabbits
There are a certain number of hens and rabbits in a room. The number of feet of the hens exceeds the number of feet of the rabbits by 12, while the number of heads of the hens exceeds the number of the heads of the rabbits by 28. Then the number of hens a
Number series key
A series of numbers was created according to a specific key. Uncover it and fill in the last two missing numbers. 2-3-6-15-42-? -?
Dance couple arrangement
Six boys and six girls (among them Emil, Felix, Gertrude, and Hannah) want to dance. The number of ways they can make six (mixed) couples if Emil does not want to dance with Gertrude and Hannah wants to dance with Felix is?
Number digit pairs
Express the numbers 18, 28, 32, 40, 48, and 200 as numerical expressions composed of exactly five pairs.
Number digit five
Express the numbers 18, 28, 32, 40, 48, and 200 as numeric expressions composed of the digits 5.

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