1 to 6
<span>
Read more at http://www.crackact.com/act/math/question-175-answer-and-explanation.html#meW66CYbSBhol9Ry.99</span>
It is a safety procedure in industries that lock dangerous machines and ensure that there is no operation until maintenance or repairs have been made.
There is no ads on this app...
You must be lost