Percentages - problemsOur percentage calculator will help you quickly calculate various typical tasks with percentages.
From complete sets of playing cards (32 cards) we pulled out one card. What is the probability of pulling the ace?
- Sea water
Seawater contains about 6.8% salt. How many dm3 of distilled water we must pour into 30 dm3 of sea water to get water with 1.9% salt?
- Sea water
Mixing 68 kg of sea water with 73 kg rainwater is created water containing 3% salt. How many percent sea water contains salt?
The count of accidents in 1993 caused 8009 women which is 7.1%. How many men caused the accidents?
The population grew in the city in 10 years from 14000 to 27500. What is the average annual percentage increase of population?
- Discounts on rail (ZSSK)
The railway company ZSSK offers a discount of 40% (JUNIOR RAILPLUS EURO
- Election mathematics
In elections, 6 political parties received this shares of voters: strana A 69.4 %strana B 11.2 %strana C 10.2 %strana D 7.6 %strana E 1.6 % Calculate what the shares acquired in the parliament, if a quorum is 5%.
76% acid was make from same acid of two different concentrations. Amount weaker acid to the stronger acid is in ratio 2:1. What was the concentration of the weaker acid, if stronger had 94% concentration?
Mother bought 5 boxes of milk and 7 kg of potatoes and paid a total CZK 147. Aunt bought 7 boxes of milk and 3 kg of potatoes and paid 131 CZK. What is the price of one carton of milk and 1 kg of potatoes? How CZK together would have saved if bought at the
- Cone and cube
About what percentage hase cone with base radius r larger volume than same high cube with square base with edge length r?
Number 389 divide into the two addends that the first was 6 greater than 60% of the second. Determine these addends.
Apartment on the first floor was 10% more expensive than the same apartment on the second floor. The difference was 105 Kc annually. Calculate the annual rent of the apartment in the first floor and from apartment on the second floor.
- Sales off
If a sweater sells for $ 12 after a 25% markdown, what was its original price?
The length of the rectangular hop garden Mr. Smith increased by 20% and its width by 20%. What is the percentage change in area of hop garden?
The suit cost 218 euros. How much cost the pants if it is 40% cheaper than the jacket.
- 100 %
How much is 100%, if 75 % is 1431?
- The farmer
The farmer harvested 840 tons of grain in 2006, which was 44% less than in 2005, and one-fifth more than in 2004. How many tons of grain harvested in years 2005 and 2004?
- Simple interest 3
Find the simple interest if 25657 USD at 4.4% for 25 weeks.
- Church roof
The roof of the church tower has the shape of a regular tetrahedral pyramid with base edge length 5.4 meters and a height 5 m. It was found that needs to be corrected 27% covering of the roof area. What amount of material will be required?
- New refrigerator
New refrigerator sells for 878 USD, Monday will be 25% discount. How much USD will save, and what will be the price?