Answer:
9 hours
Explanation:
ok so you first translate it into proper form
the proper form is 16 + 6h = 70 h is for hours
so minus 16 from both sides
16 + 6h = 70
-16 -16
now its 6x = 54
so now divide both sides by 6
6x/6 = 54/6
so its now x = 9
so she checked it out for 9 hours.