6
twice a number can be 2x and six less than it is 2x-6.
The number works out as 14
5
The number is 32 because (2*32) -8 = 56
Twenty more than twice a number is 52
2n-4
eight less than twice a number
Let the number be x Twice a number means 2x 7 less than twice a number means 2x-7
2n - 8 < 5n + 10 -3n < 18 n < -6
11
Anything less than or equal to 74. 37, for example, goes into 74 twice, and 74 goes into itself once.
7x - 8 = -297x - 8 + 8 = -29 + 87x = -217x/7 = -21/7x = -3