Percentages practice problems - page 36 of 111
Number of problems found: 2219
- Parking time interval
Determine the interval estimate of the standard deviation of the meantime to find a parking space. We found out from a survey of 200 residents that the average time is one hour and 25 minutes, and the standard deviation is 15 minutes. Use a 1% significanc - Cylinder cube percentage
Calculate the percentage of the cube volume that represents the volume of the cylinder inscribed in the cube. The cylinder's bases are circles inscribed on two opposite walls of the cube with an edge a = 14 cm. - Bronze
How much tin is in 3.6 kg of bronze if it contains 15%? - Plants
The number of germinated plants increased by 50% to 300 from morning to evening. How many plants germinated in the morning? - Figure set probability
The set contains 12 different figures. How many unidentified individual figures do I have to buy to have precisely two complete sets with a 90% probability after unpacking them? - After the discount
The dishwasher costs 210 EUR after the discount. How much did it cost before the discount if the new price is 90% of the original price? - Hockey match
The home team won the hockey match with a result of 5:4. How many shots were fired at the goalkeeper if his success rate was 42.86% in the match? - Saving account
After a year, the bank added 54 euros to Mrs. Eva's savings account. The interest rate on her savings account is 1.25% p.a. How many euros did Mrs. Eva have in her account a year ago? - Nitric acid
We want to prepare 200 g of 30% nitric acid. We have enough 12% and 60% of this acid. How many of which will we need? - Block edge reduction
We will reduce one edge of the block with dimensions of 2cm, 4cm, and 6cm by 20%. How does the volume of a block change? What percentage? - A student 3
A student earned a grade of 80% on a math test with 20 problems. How many problems on this test did the student answer correctly? Round to the nearest whole number. - Milk cream mixture
I want to turn to help with the following example. How do I reach an 8% solution? I need to mix 3.5% milk with 33% cream. Thank you for being so helpful. - Bottle defect proportion
The enamel for the production of bottles contains defects. The average number of caries is 15 per 100 kg. The bottle weighs 1 kg. What is the proportion of defective bottles? - Loan interest rate
Mrs. Betka took out a loan of 8,300 euros. After a year, she paid interest of 415 euros. What is the interest rate on Mrs. Betka's loan? - Stock market 3
Because of a political crisis, the country's stock market index dropped by 600 points. Before the crisis, the country's stock market was performing well at 8,000 points. By how many percent did the country's stock market index points drop? - Change and percentages
What is the percent of change from 35 to 62? - Juice water mixture
The drink was mixed from one hundred percent juice and water in a ratio of 1.5 liters of juice to 2.5 liters of water. Calculate how many liters of this drink will be created by mixing 1 liter of water and juice in the corresponding ratio. Calculate how m - Classroom commute students
In the classroom, 50% of students come from other districts. One-third of them commute by bus, a fifth by bike, and seven pupils walk. How many students are in the class? - Pupils
Three hundred fifty pupils attend the school, of which 210 are girls. What percentage of boys attend school? - Deposit interest calculation
How much € do we have to save on a three-month term deposit with an interest rate of 2.5% pa? If we want the deposit to earn an interest of € 1,100
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