Current location - Training Enrollment Network - Mathematics courses - The mathematical sum of 1995 is 24, and the sum of four digits less than 20 14 is equal to 24. How many numbers are there?
The mathematical sum of 1995 is 24, and the sum of four digits less than 20 14 is equal to 24. How many numbers are there?
Thousands *** 14 is not equal to 24, and thousands * * 1000 is less than 20 14. The sum of the last three digits must be equal to 23. If there are two 9s in the last three digits, it is1995,65438. If there is 9, the last three digits can be composed of 6, 8 and 9 ***6; Can be composed of 7, 7 and 9 ***3; If there is no 9, it can only be composed of 8, 8 and 7 ***3.

So * * * has 3+6+3+3= 15.