Percentages practice problems - page 97 of 111
Number of problems found: 2219
- School library
The school library contains 6300 books. These comprise 7% of professional books for teachers, 18% of interest books and encyclopedias for pupils, and the rest of the fairy tales. How much are which books each type? - Backpack
A large backpack costs CZK 1352. Little is 35% cheaper. How much do we pay for five large and two small backpacks? - Metal box
How much metal do we need to produce in a box with dimensions of 5 dm, 30 cm, and a height of 1 m? Add 12% of the waste and fold. - Joshka
Joshua had € 15. Mama took him 15%. How many had left? - Average mark
Calculate the average mark in English if a student got a couple of 3's, 20% less two than 3, and 50% more 1's than the 2's. - Lathe
Calculate the percentage of waste if the cube with 44 cm long edge is lathed to the cylinder with a maximum volume. - Rain
The empty barrel with a radius of 8 dm and height of 1.2 m rain filled to 75% of its capacity. How many mm of water rained on the roof space of 75 m² - Forces
Determine the resultant of two perpendicular forces F1 = 560 N and the second force 25% smaller. - Property
The length of the rectangle-shaped property is 8 meters, less than three times the width. If we increase the width by 5% of the length and the length by 14% of the width, the property perimeter will increase by 13 meters. How much will the property cost p - TVs
Production of television sets increased from 3,500 units to 4,200 units. Calculate the percentage of production increase. - Medicine
We test medicine on six patients. For all, the drug doesn't work. If the drug success rate of 20%, what is the probability that medicine does not work? - Metal sheet
The box has the shape of a cube with an edge length of 50 cm. How much m² of sheet metal is needed to beat a box if we add 20% on the folds of the lid and walls? - Bricks
Openings in perforated bricks occupy 10%, and brick has dimensions of 30 cm, 15 cm, and 7.5 cm. Calculate a) the weight of a perforated brick if you know that the density of the full brick material is p = 1800 kg/m³ (1.8 kg/dm³) b) the number of perforate - Nectar
Nectar collected by bees contains 70% water. The nectar of the same process produces honey which has 19% water. How many kilograms of nectar do bees need to collect to make 1 kg of honey? - Car value
The car loses value by 15% every year. Determine a time (in years) when its price will halve. - Alcohol mixing
How much 55% alcohol must we pour into 1500 g 80% alcohol to form a 60% alcohol? How much is 60% alcohol created? - Spirit From 55% and 80% spirit, we would like to produce 0.2 kg of 60% spirit. How many of them must we use in a solution?
- Container with water
The weight of a container with water is 2.48 kg. Suppose the cast is 75% water, and the container with water weighs 0.98 kg. Determine the weight of the empty container. How much water was originally in the container? - Crane overload
The truck crane has a load capacity of 4 tons. How many kilograms can we overload it if the maximum limit of 115 percent load capacity is allowed? - Sales off 2
The computer monitor sold for 8400 CZK in March. In April, the dealer price decreased by 798 CZK. Calculate the percentage by which the retailer reduced the price.
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