All pairs
Find all pairs (m, n) of natural numbers for which is true:
m s (n) = n s (m) = 70,
where s(a) denotes the digit sum of the natural number a.
m s (n) = n s (m) = 70,
where s(a) denotes the digit sum of the natural number a.
Correct answer:
You need to know the following knowledge to solve this word math problem:
Themes, topics:
Grade of the word problem:
Related math problems and questions:
- Four-digit numbers
Find four-digit numbers where all the digits are different. For numbers, the sum of the third and fourth digits is twice the sum of the first two digits, and the sum of the first and fourth digits is equal to the sum of the second and third digits. The di - Four-digit number
Find all four-digit abcd numbers with a digit sum of 12 such that ab-cd = 1 - Four-digit 55481
Find all four-digit abcd numbers to which abcd = 20. ab + 16. cd, where ab and cd are double digits numbers from digits a, b, c, and d. - Digits A, B, C
For the various digits A, B, and C is true: the square root of the BC is equal to the A, and the sum B+C is equal to A. Calculate A + 2B + 3C. (BC is a two-digit number, not a product).
- Digit sum
Find the smallest natural number n, the digit sum of which equals 37. - Two-digit 7818
Find the sum of all two-digit numbers in which the digits differ by 7. - In which
In which of the following expressions does the number 16 fill in the blank so that the equation is true? Select all that apply. A) 8(___ + 3) = 32 + 24 B) 8(2 + 9) = ___ + 72 C) 4(7 + 4) = 28 + ___ D) 8(5 + 6) = 40 + ___
