The answer would be 18 minutes, because 12 divided by 2/3 is 18 which would be 18 minutes
The first one x is greater than and equal to 34
58 stamps is the number she gets each week. So if she went for one week, 58*1=58. 58*2=116 and so on. Because we don't know the exact number of weeks, we say 58w or 58*w because you multiply however many number of weeks she collects.