Percentages - high school - math problems
Number of problems found: 250
The population grew in the city in 10 years from 30000 to 34000. What is the average annual percentage increase of population?
By what percentage does the sound intensity increase if the sound intensity level increases by 1 dB?
1000$ is invested at 10% compound interest. What factor is the capital multiplied by each year? How much will be there after n=12 years?
How much percent has changed (reduced) area of pipe cross-section, if circular shape changed to square with same perimeter?
- 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?
- Three colors
Find the probability that 3 balls of the same color will be drawn from fate with 10 white, 10 red, and 10 blue balls.
Kostka je vepsána do koule o poloměru r = 6 cm. Kolik procent tvoří objem kostky z objemu koule?
- Three dice
What is the probability that when we roll three dice, we roll the numbers 1,2,3?
From complete sets of playing cards (32 cards), we pulled out one card. What is the probability of pulling the ace?
- Vinegar mixing
We mix 70g water and 50g 8% vinegar. How many percents of the solution of vinegar we produce?
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?
- The bus stop
The bus stop waiting room has the shape of a regular quadrilateral pyramid 4 m high with a 5 m base edge. Calculate how many m2 roofing is required to cover the three walls of the sheathing, taking into account 40% of the additional coverage.
- Cube edges
If the edge length of the cube increases by 50%, how does the volume of this cube increase?
Sixty percent of one-fifteen of the total is equal to thirty. What are two percent of the total?
- Road drop
On a straight stretch of road is marked 12 percent drop. What angle makes the direction of the road with the horizontal plane?
I borrow 25,000 to 6.9% p.a.. I pay 500 per month. How much will I pay and for how long?
If the product twice price cut by 25%, what percentage was price cut in total?
- 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?
If you deposit 719 euros the beginning of each year, how much money we have at 1.3% (compound) interest after 9 years?
- An investment
How long will it take for an investment to double at a simple interest rate of 5.10% p. A. ? Express the answer in years and months, rounded up to the next month.
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