Mixtures and solutions + percentages - math problems

Number of problems found: 54

  • Solutions, mixtures
    roztoky We have 2 liters of 20% solution available. How much 70% solution do we need to add to it to get a 30% solution?
  • Lemonade
    juice Iva added one liter of 100% fruit juice to 3 liters of water. She left two liters of it for Alice and Beata. She added two more liters of water to the remain two liters of lemonade and offered it to other friends. a. What percentage of juice did Alena and
  • Alcohol mixing
    roztoky How much 64% of the alcohol must be poured into 6 liters of 85% alcohol to produce 79% alcohol?
  • Pouring alcohol
    roztoky 100 liters of alcohol has 70% How many liters of water need to be added to have 60% alcohol?
  • Alcohol
    chemia 6l 48% alcohol, how much 52% alcohol must be added to give 50% alcohol?
  • Copper sulphate
    CuSO4crystal How much g of water do we have to add to 240 g of an 84% CuSO4 solution to produce a 60% solution? (Express the mass of crystalline CuSO4 in the original solution and in the resulting solution and compare them. )
  • Mushrooms
    hriby Mushrooms lose 90% by weight drying. How many fresh mushrooms are needed for 5 kg of dried mushrooms?
  • Acid evaporation
    roztoky How many kilograms of water do we have to evaporate from 100 kg of 32% acid to make it 80% concentration?
  • Clogging
    h2o2 How much-distilled water must the pharmacist add to 30g of a 30% hydrogen peroxide solution to obtain a 3% solution to clogging?
  • Vinegar mixing
    vinegar We mix 70g water and 50g 8% vinegar. How many percents of the solution of vinegar we produce?
  • Mushrooms
    hriby Fresh mushrooms contain 88% water, dried 14% water. How many kilograms of fresh mushrooms should be collected to get 3 kg of dried?
  • Fruit tea
    tea Tea contains 7% of fruit components and 12% of sugar in this component. How many percents of sugar is represented in the whole tea?
  • Peroxide
    chemia How many ml should we pour 30% of peroxide (H2O2) into 100ml H2O to give a 20% solution?
  • CuSO4 mixture
    chemia How many grams of solid CuSO4 we have to add to 450g of 15% CuSO4 solution to produce a 25% solution?
  • Solutions, mixtures
    roztoky How many liters of 70% solution we must add to 5 liters of 30% solution to give us a 60% solution?
  • Fruit juice
    cukr Fruit juice contains 37.5% sugar. How many percents of sugar will be in the flavored mineral that we prepare from 100 grams of fruit juice and 1.4 liters of mineral? (1 liter = 1 kg)
  • Mixture 2
    roztoky How many liters of water must be added to 7 liters of a 20% solution to obtain a 10% solution?
  • Mixture
    roztoky How many percentages mixtures do we get by adding 23ml of matter to 89ml of water?
  • Alcohol mixture
    pipe2 Three liters of 96 percent alcohol set up a certain amount of distilled water to form 54-percent alcohol. How many liters of distilled water was used?
  • Salt
    salt Seawater containing 5% salt. How many kg of freshwater necessary to pour into 40 kg of seawater so that the salinity fell to 2%?

Do you have an interesting mathematical word problem that you can't solve? Submit a math problem, and we can try to solve it.



We will send a solution to your e-mail address. Solved examples are also published here. Please enter the e-mail correctly and check whether you don't have a full mailbox.

Please do not submit problems from current active competitions such as Mathematical Olympiad, correspondence seminars etc...



Our percentage calculator will help you quickly calculate various typical tasks with percentages. Mixtures and solutions - math problems. Percentages Problems.