Option A is correct. The required equation that could be used to find this number is
x + 6 = 2x +8.
Let the unknown number be 'x'
Since sum is also known as addition, the sum of the number and 6 is expressed as x + 6 ... 1
Twice the unknown number is expressed as 2x
8 more then twice the number is expressed as 2x + 8...... 2 (Note that "more than the number" means addition)
To get the required equation that could be used to find x, we will equate 1 and 2 to have:
x + 6 = 2x + 8
Hence the required equation that could be used to find this number is x + 6 = 2x +8.
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