Percentages practice problems - page 19 of 112
Number of problems found: 2224
- Salt solution
The 50% salt solution must be diluted with distilled water to make 20 liters of 35% solution. How many liters of original solution and how many liters of water do we need? - Road gradient angle
On the traffic sign that informs about the road's gradient, the figure is 6.7%. Determine the slope angle of the path. What height difference is covered by the car that traveled 2.8 km on this road? - Interest rate increase
The bank increased the interest rate from the original value of 4% to 5%. What percentage of the original value of the interest rate was its increase? - Vinegar acetic acid Kitchen vinegar is an 8% solution of acetic acid in water. How many liters of acetic acid are needed to produce 275 liters of vinegar?
- Traffic sign material
Traffic signs are equilateral triangles with a side length of 900 mm. How many euros does a galvanized sheet cost to produce 50 pieces of such brands if we consider adding 15% of the material for waste? The price of 1 square meter of sheet metal is 6.5 eu - State birth population
Calculate how many people were born in the state; if the total population was 10,000,000 this year, the natural increase was 2%, and 5,000 people died. - Book pages remaining
The book has 1200 pages, of which Róza has already read 60%. How many pages has Rose not read so far? - Radiation shield
Determine what thickness of the shielding material will be required if we reduce the radiation to 3% of the original value if we know that a thickness of 6 mm will reduce the level of the same radiation by 9%. Round up to the whole value in millimeters (t - Price increase percentage
By what percent did the product price increase in the store if we proceeded with the price increase by multiplying the original price by 1.16? - Forest Žilina hectares
There are 2.17 million hectares of forest in Slovakia. The Žilina region occupies 20% of the total area. How many hectares of forest are there in the Žilina Region? - Network survey percentage
The students surveyed the number of networks on the Internet. 94% used Facebook, 19% used Twitter, and 42% used Google. How many did not use Facebook if the number of respondents was 310? - What quantity
What quantity of concrete should be ordered for concreting a rectangular family house with dimensions of 15 m × 12.6 m using permanent formwork? The depth of the foundation formed by permanent formwork is set at 80 cm. The concrete used constitutes 80% of - Number percentage difference By what percentage is the number 15 different from the number 12?
- Block edge change
The block has 10 cm, 20 cm, and 50 cm dimensions. We reduce the first edge of the cuboid by 20% and increase the second by 20%. How does the volume of the cuboid change? By how many percent? - Battery charging capacity
The battery capacity is 50 Ah. With a current of 5A, we charge the accumulator to 100% capacity in 10 hours. To what percentage of capacity can we charge the accumulator with a current of 2A in 15 hours? - Justify
50 bottles of red wine are purchased for a company party. In the first store, a bottle of wine costs €6.90. Here they have a promotion that when you buy 4 bottles, the fifth one is free. In the second store, the same bottle of wine costs €8.50. However, t - Parliament program approval
4/5 MPs took part in the autumn parliamentary meeting. 80% of those present voted for the proposed program. According to the rules, the program can only be approved if at least 60% of all deputies vote for it. Was the program approved or not? - Refrigerator - discount
The refrigerator was first discounted by 20% and then increased in price by 5%. Now the Zmrzlin family bought it for 420 euros. How much was the refrigerator before the discount? - Individual
To prepare 14 kg of cheese with 45% dry matter, 3 types of cheese mixtures were mixed. The first was 5 kg, the second was 3 kg and had 14% more dry matter (14 percentage points more) than the first. The third mixture, which had 2 times as much dry matter - Tennis serve percentage
The tennis player won precisely 55% of the balls during his serve. In doing so, he served less than thirty times. How many times did he serve?
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