The equation is given as: 2/7 = 2/ ?
Let the unknown number be represented by the symbol x
Thus, the equation is rewritten as:
2/7 = 2/x
Now, multiply both sides of the equation by x. This is as follows:
x * (2/7) = (2/x) * x
2x/7 = 2
Now, multiply both sides of the equation by 7. This is as follows:
7* (2x/7) = 2 * 7
2x = 14
Now, divide both sides of the equation by 2
2x/2 = 14/2
x = 7
Therefore, the number that completes the equation is 7 (Option C)