Reason + percentages - math problems

Number of problems found: 82

Inflation
What is better for people (employees)? ?
Probability
$fractions_1$ 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?
Medicine
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%?
Discount
The dress was discounted by CZK 115, which was 12% of the original price. What is the cost of the dress after the discount?
Accidents
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.
Bonus
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?
VAT
John paid 1000 Euros in store for purchase. Calculate value added tax (VAT), which paid in purchase, if the VAT rate is 20%.