2 * (x + 7) 2x + 14 ■
666
10
The number is 17.
2x+7=n
2x + 7 = 30 - 7 - 7 2x = 23 x = 23/2 x = 11.5
11,33
x = 11
The difference between a number x and twice y is equal to fifteen.
The number is 7.
If the number is n, then twice the number is 2n and the sum of the two is n + 2n = 3n.
The question cannot be answered because it is ambiguous. Does "twice the sum of 16 and a number" mean "2*16 + x" or does it mean "2*(16 + x)"
2x+63=191 2x = 128 x = 64