10
x+2x=303x=30 x=10
2x + 7 = 30 - 7 - 7 2x = 23 x = 23/2 x = 11.5
It is: 15+15 = 30
If you mean... -7+x*2=23 then x = 15. Done without the aid of a calculator ! The value of 'x' (the unknown number) MUST equal 30, because 30-7=23 - SO, half the unknown number must be 15!
The numbers seem to be 61 and the dirty Gertie, blind 30.
x+2x=303x=30 x=10
20
2x + 7 = 30 - 7 - 7 2x = 23 x = 23/2 x = 11.5
39
There are two solution: -3 and +2.
It is: 15+15 = 30
There aren't any numbers like that. You might be thinking of 28, which has a sum of all its factors equal to twice itself, making it a perfect number. Proper factors are a different set.
Correction: Here is the equation you will need to solve: 7N - 30 = 2N + 5 --> 5N = 35 --> N = 7
the unknown number is 30 as 50 = x +2(10) so 50 = x+20 so 30 = x
Thirty: 30*2+60=120
If you mean... -7+x*2=23 then x = 15. Done without the aid of a calculator ! The value of 'x' (the unknown number) MUST equal 30, because 30-7=23 - SO, half the unknown number must be 15!
The numbers seem to be 61 and the dirty Gertie, blind 30.