Question 919726
x   How long it would take Mary to finish the job working alone
{{{ 1/6 + 1/x = 1/4}}} |Multiplying thru by 12x so as all denominators = 1
2x + 12 = 3x
 12hr = x, How long it would take Mary to finish the job working alone
and...checking
2/12 + 1/12 = 1/4