A fraction is 13 out of 22. After adding the same number x to the numerator and denominator, the ratio of numerator to denominator is 3:2. What is x? - 40 is not right. I hope I can make a good list of the tests and work out the results;

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• 1. Add a number to the numerator and denominator of the fraction 1999 / 1997, and the new fraction is equal to 1999 / 2000?
• 2. The sum of the three fractions is two and one seventh. The fractional units of the three fractions are the same. The numerator is a continuous natural number. What are the three fractions?
• 3. Add a same natural number to the numerator and denominator of 1 / 13 at the same time to get another fraction equal to 1 / 2. What is the natural number?
• 4. The sum of two continuous natural numbers is 21, and the least common multiple of the two numbers is______ ．
• 5. The sum of the three simplest true fractions is 1 and 7 / 5. Their denominator is the same, and the numerator is three adjacent natural numbers. What are the three fractions
• 6. The numerator and denominator of a true fraction are two consecutive natural numbers. If the denominator is added with 5, the resulting fraction will be about 5 / 7, and the original fraction will be?
• 7. The sum of the numerator and denominator of a simplest fraction is 62. If the numerator is reduced to 1 and the denominator is subtracted by 7, the new fraction will be reduced to 2 / 7. What is the original fraction?
• 8. When ABC is written as the simplest fraction, the sum of numerator and denominator is 58? Are you sure?
• 9. For a simplest fraction, the sum of numerator and denominator is 70. If the numerator and denominator are all reduced by 5, the original fraction can be obtained by 2 / 3
• 10. The sum of numerator and denominator of a fraction is 67. If 5 is added to each numerator and denominator, the ratio of numerator and denominator is 2:5, and the original fraction is 67___ ．
• 11. Add both the numerator and denominator of 113______ It can be divided into 13
• 12. 1. Add a number to the 13 / 27 numerator, subtract the same number from the denominator, and the result is 7 / 3. Find this number 2. After converting 6 / 7 into a decimal, what is the 18th digit after the decimal point? What is the 18th digit above the 2008 digit? 3. The greatest common multiple of two numbers is 120, and the least common factor is 8. One of them is 24. What's the other number?
• 13. What is the number a when the denominator of 13 of 27 plus a and the denominator minus a equals seven thirds?
• 14. For a fraction, the sum of the numerator and denominator is 28. If the numerator subtracts 1, the fraction equals 2, and the original fraction is ()
• 15. The sum of the numerator and denominator of a fraction is 91. If the numerator is increased by 3 and the denominator is decreased by 3, the resulting fraction is about 34. What is the original fraction?
• 16. There is a fraction which is about 511. The sum of numerator and denominator before reduction is 48. The fraction before reduction is 511______ ．
• 17. 18 △ 3x equation
• 18. Add 45 to the numerator of the score 911. To make the score still equal to 911, add 45 to the denominator______ ．
• 19. When Ma Xiaohu solved the equation (2x-1) / 3 = (x + a) / 3-1, the - 1 on the right side of the equation was not multiplied by 3 when the denominator was removed, so he obtained the solution of the equation as x = 2 and the value of A
• 20. The sum of the numerator and denominator of a fraction is 25. If you add 5 to the numerator, the fraction is 1