# Unknown number related questions in linear equations

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##### Examples

###### Lessons

- Two numbers have a sum of 24. Find the two numbers if the second number is 6 times the first one.

- The sum of four times one number plus two times a second number is eight. The sum of three times the first number plus 5 times the second number is 24. Find the numbers.

- Sarah is three times as old as her sister Jenny. In nine years the sum of their ages will be 26. How old are they now?