Reason + percentages - math problems
Number of problems found: 82
What is better for people (employees)? ?
How probable is a randomly selected three-digit number divisible by five or seven?
- Three reds
What is the probability that when choosing 3 carats from seven carats, all 3 reds will be red?
- Extreme temperatures
USA hit extreme heat wave. Calculate percentage of the air temperature change from normal summer temperature 23 °C to 40 °C.
- Win in raffle
The raffle tickets were sold 200, 5 of which were winning. What is the probability that Peter, who bought one ticket will win?
We test medicine on 6 patients. For all drug doesn't work. If the drug success rate of 20%, what is the probability that medicine does not work?
- Two aces
From a 32 card box we randomly pick 1 card and then 2 more cards. What is the probability that last two drawn cards are aces?
- Test points
If you earned 80% of the possible 40 points, how many points did you miss to get 100%?
- Birthday paradox
How large must the group of people be so that the probability that two people have a birthday on the same day of the year is greater than 90%?
The dress was discounted by CZK 115, which was 12% of the original price. What is the cost of the dress after the discount?
The count of accidents in 1995 caused 8780 women which is 8.4%. How many men caused the accidents?
- Unknown number 10
Number first increased by 30%, then by 1/5. What percentage we've increased the original number?
- On a farm
On a farm, there are 90 rabbits, 700 sheep, 300 cattle and 500 pigs. What percentage of the total number of animals are rabbits?
- TV fail
The TV has after 10,000 hours average 35 failures. Determine the probability of TV failure after 400 hours of operation.
The gross wage was 1323 USD including 25% bonus. How many USD were bonuses?
- VAT on books
The cost of a book in the store is 12.5 euros. How much euros is the VAT of this book? VAT is 10%.
- The city
In the city is 2/4 of women married to 3/4 men. What percentage of townspeople is single (not married)?
- Left handed
It is known that 25% of the population is left-handed. What is the probability that there is a maximum of three left-handers at a seminar where there are 30 participants?
- Temperature calculus
Calculate the percentage of temperature increase if changed from 18°C to 33°C?
John paid 1000 Euros in store for purchase. Calculate value added tax (VAT), which paid in purchase, if the VAT rate is 20%.
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