42
what two factors of -21 add up to -6
21
Add 21 to the year: 1987 + 21 = 2008 → You turned 21 on 9th April 2008.
21, 21, 21, 21 , 15, 1
The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
The inverse operation of adding 21 is subtracting 21. This means that if you subtract 21 from a number, and then add 21 to the result, you will get back to the original number.
21, 21, 21, 21 , 15, 1
-1
The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
Well, 18 and 3 (both factors of 36) add up to 21. As well, the factors 12 and 9 add up to 21.
20 + 1
21
How do you add 9, 5, 3, and 1 in such a way to get sum of 21 by using only 6 numbers?You would add 9+5+3+1+1+2 and your answer would be 21.
119
add 21 and 13 and double the answer!
44
22