24
Eight added to twice a number is 42.Give the number the name of ' X '.8 + 2X = 42' X ' is 17.
One.
12
17+17+17=51
If a number is added to itself, it is twice that number → 18 ÷ 2 = 9 → 9 + 9 = 18
Thirty: 30*2+60=120
Let the number be x If: 2x+60 = 120 Then: x = 30
6x + 18 = 4 - x 7x + 18 = 4 7x = -14 x = -2
-8
43
Because 51 is an odd number, it cannot be totalled by adding the same number twice.
There are two answers either 8x + 4 or 7x + 4