Honza

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

Result

x =  15

Solution:


9*(13+x) = 7*(21+x)

2x = 30

x = 15

Calculated by our simple equation calculator.

Try another example


Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!





Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
1st comment
Be the first to comment!
avatar




Tips to related online calculators
Need help 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 quadratic equation?
Do you want to convert time units like minutes to seconds?

Following knowledge from mathematics are needed to solve this word math problem:

Next similar math problems:

  1. Midnight
    clocks2_7 How many hours are, if the time that elapsed since 8:00 is 2/5 of the time that will past till midnight?
  2. Three monks
    Bible Three medieval monks has task to copy 600 pages of the Bible. One rewrites in three days 1 page, second in 2 days 3 pages and a third in 4 days 2 sides. Calculate for how many days and what day the monks will have copied whole Bible when they begin Wednes
  3. School
    662536762_868 School attend 792 children, boys and girls ratio is 4:5. How many more girls go to school (than boys)?
  4. There
    jablone_12 There are 32 trees of three species in the orchard. 25% cherries, three eighty pears, others plums. How many plums are in the orchard?
  5. Three people
    clocks_16 Three people start doing a work at a same time. The first worked only 2 hours. The second ended 3 hours before the end. On an individual basis, it would take the first time to do the work 10 hours, second 12 hours and 15 hours third. How many hours did it
  6. Ratio 11
    zlomky_7 Simplify this ratio 10 : 1/4
  7. Equation with mixed fractions
    fractions 2 3/5 of 1430+? = 1900. How to do this problem
  8. Unknown number 23
    cisla_4 Find 2/3 of unknown number, which is two thirds of the 99.
  9. One third
    one-third If 3/5 is 360, how much is 1/3?
  10. Eqn
    fractal_16 Solve equation with fractions: 2x/3-50=40+x/4
  11. Equation 20
    eq222_21 In given equation: 8/9-4/5=2/9+x, find x
  12. Eq-frac
    fractions14 Solve the following equation with fractions: h + 1/3 =5/3
  13. Unknown number
    fractions_6 I think the number - its sixth is 3 smaller than its third.
  14. Fraction + eq
    eq1 Solve following simple equation with fractions: -5/6(8+5b) = 75 + 5/3b
  15. Simple equation 5
    eq222_17 Solve equation with fractions: X × 3/8 = 1/2
  16. Simple equation 6
    eq1_9 Solve equation with one variable: X/2+X/3+X/4=X+4
  17. Fifth of the number
    numbs_5 The fifth of the number is by 24 less than that number. What is the number?