If you want to stick to integers:
1 x 18 = 18
2 x 9 = 18
3 x 6 = 18
-1 x -18 = 18
-2 x -9 = 18
-3 x -6 = 18
To find two numbers that add up to 18, we can set up an algebraic equation. Let's call the two numbers x and y. The equation we need to solve is x + y = 18. Since we are looking for two numbers that add up to 18, there are multiple possible solutions. For example, one possible pair of numbers that add up to 18 is 10 and 8, as 10 + 8 = 18.
18
288. All multiples of 9 will have digits that add to a multiple of 9. To get a multiple of 9 to be all even, you need to get them to add to 18, since no set of even numbers will add up to 9. 288 is the lowest multiple of 9 to be able to add to 18. ■
Let's denote the two numbers as x and y. We can set up a system of equations: x + y = 18 and x - y = 4. By solving this system simultaneously, we can find that x = 11 and y = 7. Therefore, the two numbers that add up to 18 and subtract to 4 are 11 and 7.
10 and 8
120 + 138
-180
-22
113
The numbers are 17 and 18.
There is no highest common multiple - for whatever value you come up with, I can always add the lowest common multiple and get another, even higher common multiple.There is the:``highest common factor'' (hcf) which is the highest whole number that divides exactly into two or more numbers; and``lowest common multiple'' (lcm) which is the smallest whole number into which two or more numbers all divide exactly.By itself 121827 cannot have a common anything as that requires two or more numbers; however, I suspect that there are spaces missing and your list of numbers is actually {12, 18, 27}, givinghcf(12, 18, 27) = 3lcm(12, 18, 27) = 108If neither, please re-enter your question with a proper number list and hcf/lcm requirement.
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