Percentages practice problems - page 34 of 111
Number of problems found: 2219
- Tournament sophomore percentage
Forty-eight high school students took part in the chess tournament. The number of first-graders, sophomores, and third-graders is 3:8:5. Calculate what percentage of sophomores participated in the game. - There 20
There are 56,800 kinds of animals. Thirty-five percent of this number live on land. How many kinds of animals live on land? - Probability
Zuzana has 5 folders with different music styles on her mobile phone. The table shows their names and the number of songs they contain. Fill in the missing number so that the rock song plays first with a probability of 21% when the random play function is - Camera double discount
The camera was reduced twice, first by one-fifth of the original price and then by a quarter of its new price. After the second discount, the camera cost CZK 8,100. How much did he face before the discounts? - Casting alloy weight
The metal casting consisted of copper and zinc. If we remelted it with 3 kg of pure copper, we would get an alloy containing 80% copper. Instead, we remelted the casting with 3 kilograms of pure zinc, so the resulting alloy contained only 50% copper. Dete - Goods season price
Goods with a price of 520 € became more expensive by 15% at the beginning of the season. At the end of the season, the goods became cheaper by 10%. How much did the goods cost at the end of the season? - Parallelogram perimeter area
The parallelogram has side a = 58cm and diagonals u = 89cm and v = 52cm. Calculate the perimeter and area of this parallelogram. - Observation angle
At what angle of view does an object 70 m long appear to the observer, 50 m away from one end and 80 m from the other end? - Delivery scrap percentage
In the first delivery of 120 parts, there was 5% waste. In the second delivery in which, 10% of the 80 were scrapped. How much scrap was brought in with the first and second deliveries combined? What % of scrap was there in both deliveries of parts, out o - 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? - A beauty
A beauty supply company has 53 liters of 5% hydrogen peroxide solution on hand and a nearly limitless amount of a solution containing 35% hydrogen peroxide. How many liters of the 35% hydrogen peroxide solution should the company add to the 5% hydrogen pe - Company employee percentage
The company employs 20% more women than men and 240 women. How many employees are there? - Deposit
At the beginning of the year, Michael's father opened a bank account in which he deposited 1,800 euros. At the end of the year, he had 1,845 euros in his bank account. What was the annual interest rate in percent? - Probability
Two duelists have agreed to fight at a designated location between (6:00 and 7:20). One of them will wait 8 minutes after arriving at the location and then leave. The other will wait for his opponent for 16 minutes and then leave. What is the probability - Cube edges length
If we reduce the length of the cube edge by 30%, this reduced cube has an area of 1176 cm². Specify the edge length and volume of the original cube. - Cube edge reduction If we reduce the length of the cube edge by 30%, this cube has a reduced surface area of 1176 cm². Find the edge length and volume of the original cube.
- Pipe water percentage
Through the first pipe, 90 hl of water flows into the tank per hour, and 2.7 l of water per second through the second pipe. Calculate by what percentage more or less water flows per unit time into the tank through the second pipe than through the first pi - 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? - Car plant employees
4020 employees work in the car plant. 35% of the work by bus, 40% by car, and the rest by bike. How many employees go to work by bike? - Book discount twice The book was twice as 10% cheaper as € 5.60. How much does it cost now
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