Percentages + volume - math problems

Number of problems found: 99

  • Lemonade
    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 remaining two liters of lemonade and offered it to other friends. a. What percentage of juice did Alena
  • The ball
    The ball has a radius of 2m. What percentage of the surface and volume is another sphere whose radius is 20% larger?
  • Pouring alcohol
    100 liters of alcohol has 70% How many liters of water needs to be added to have 60% alcohol?
  • Alcohol
    6l 48% alcohol, how much 52% alcohol must be added to give 50% alcohol?
  • Water in vegetables
    Tomatoes in the store contain 99% water. After being transported to the shop, they were slightly dried and contained only 98% of water. How many kgs of tomatoes are in the store if there were 300 kg in stock?`
  • Camel and water
    84% of the camel's weight is water. After drinking, its weight increased to 832 kg, and water accounted for 85% of its weight. How much did it weigh before drinking?
  • Gasoline-oil ratio
    The manufacturer of a scooter engine recommends a gasoline-oil fuel mixture ratio of 15 to 1. In a particular garage, we can buy pure gasoline and a gasoline-oil mixture, 75% gasoline. How much gasoline and gasoline-oil mix do we need to make 8.0 L of fue
  • Sphere radius
    The radius of the sphere we reduce by 1/3 of the original radius. How much percent does the volume and surface of the sphere change?
  • Lemonade
    In January, 2 liters of lemonade were sold for CZK 24, while in February, 2.5 liters of lemonade sold at same price. How much percent was 1 liter of lemonade cheaper in February than in January?
  • Diesel fuel
    In the morning, we refueled and set off. After the first stop, we passed 20% of diesel, after the second 10% of the balance. At the third stop, we had only 9 liters of diesel, and we had to refuel. How big a tank do we have?
  • Clogging
    How much-distilled water must the pharmacist add to 30g of a 30% hydrogen peroxide solution to obtain a 3% solution to clogging?
  • Winery
    The wine processing plant sold 8/15 of its total wine production to the domestic market, 2/7 to the foreign the rest of the wine. How many percents are still in stock?
  • Peroxide
    How many ml should we pour 30% of peroxide (H2O2) into 100ml H2O to give a 20% solution?
  • Pyramid cut
    We cut the regular square pyramid with a parallel plane to the two parts (see figure). The volume of the smaller pyramid is 20% of the volume of the original one. The bottom of the base of the smaller pyramid has a content of 10 cm2. Find the area of the
  • Hectoliters
    How many hectoliters of water is in a garden barrel with 90 cm diameter and a height of 1.3 m if it is filled to 80% of its capacity?
  • Cube into sphere
    The cube has brushed a sphere as large as possible. Determine how much percent the waste was.
  • Inscribed sphere
    How many percent of the cube volume takes the sphere inscribed into it?
  • Solutions, mixtures
    How many liters of 70% solution must we add to 5 liters of 30% solution to give us a 60% solution?
  • Fruit juice
    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)
  • Cube edges
    If the edge length of the cube increases by 50%, how does the volume of this cube increase?

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