Honza

Honza is 13 years old and Peter 21 years old. After how many years are their ages will be at ratio 7: 9?

Correct answer:

x =  15

Step-by-step explanation:


9•(13+x) = 7•(21+x)

2x = 30

x = 15

Our simple equation calculator calculates it.

Try another example


Did you find an error or inaccuracy? Feel free to write us. Thank you!



avatar




Tips to related online calculators
Need help to calculate sum, simplify or multiply fractions? Try our fraction calculator.
Check out our ratio calculator.
Do you have a linear equation or system of equations and looking for its solution? Or do you have a quadratic equation?
Do you want to convert time units like minutes to seconds?

You need to know the following knowledge to solve this word math problem:

Related math problems and questions:

  • Jan
    Honza Jan is 13 years and Peter 21 years old. For how many years will their ages in the ratio of 7:9?
  • Peter and Paul
    clock-night-schr Peter and Paul together have 26 years. Four years ago, Paul was twice older than Peter. How much is Paul and how much Peter?
  • Ages
    calendar Father is 36 years old, and his daughter is 4 years old. Write down the ratio of the age of father and daughter. In what ratio will the ages of father and daughter after 4 years?
  • Father and daughter
    family Father is 36 years old, daughter is 20 years less. What will be the ratio between them when they are 10 years more?
  • Ages
    age2 John, Teresa, Daniel and Paul have summary 56 years. Their ages are in a ratio of 1:2:5:6. Determine how many years have each of them.
  • Two ages
    twodigits Gabrielle is 9 years younger than Mikhail. The sum of their ages is 87. What is Mikhail's age?
  • Three friends
    three_friends Peter is eight times older than Rado, Rado is 3 times younger than Joseph. Together they have 120 years. Determine how many are each of them.
  • Maria 2
    family Maria is 7 years older than her brother Robert and in 2 years her age will be four times what Robert’s age was three years ago. Find their present ages.
  • Age ratio
    calendar Janko is 14 years old. The age ratio of Janka and Zuzka is 2: 3. What was the ratio seven years ago?
  • Basketball
    friends Peter and Franta threw to the basket. Each had 20 attempts. Peter scored thirteen and twelve Franta. Give them percentage success.
  • Age problems
    time A) Alex is 3 times as old as he was 2 years ago. How old is he now? b) Casey was twice as old as his sister 3 years ago. Now he is 5 years older than his sister. How old is Casey? c) Jessica is 4 years younger than Jennifer now. In 10 years, Jessica will
  • Ages 2
    time A man's age is 4 times his son's age. After 5 years he will be just twice his son's age, find their ages.
  • Grandfather
    family The grandfather is three years older than a grandmother. The average age of the grandmother, the grandfather, and their seven grandchildren is 28 years. The grandchildren have a total of 105 years. Calculate how old grandfather is.
  • Carla
    family Carla is 5 years old, and Jim is 13 years younger than Peter. One year ago, Peter's age was twice the sum of Carla's and Jim's age. Find the present age of each one of them.
  • Mother and daughter
    kresba The ratio of years mother and daughter is 5:2. After 7 years the ratio is 2: 1. How many years ago daughter was born?
  • Dividing money
    penize Thomas, Honza and Vasek are to divide 1220kč. Honza got 25% more than Thomas. Vasek 20% less than Thomas. How CZK each got?
  • Honza + Alice + Tonda
    minca Honza + Alice + Tonda have a total of 111 USD. The ratio between Honza and Alena is 5:6 and the ratio between Alice and Tonda is 4:5 How many money have each of them?