Question 1123388
In other words, 70% of the original number is 266.
{{{YourNumber * 0.7 = 266}}}
{{{YourNumber = 266/0.7}}}
{{{YourNumber = 380}}}

You can check by following the original question.
{{{YourNumber - (0.3*YourNumber) = 266}}}
{{{380 - (0.3*380) = 266}}}
{{{380 - (114) = 266}}}
{{{266 = 266}}}