7th total= 46
more= 28
less=18
8th total= 27
more=15
less=12
both 7th and 8th total= 73
more=43
less=30
Step-by-step explanation:
7th total: it says that 46 7th graders were surveyed so 46 7th graders were surveyed.
7th more: it said that 28 7th graders spent more then a hour so 28 7th graders spent more then an hour on the survey.
7th less: it said the there were 16 7th graders surveyed and 28 7th graders that spent more than an hour on the survey so 46-28=18 so 18 7th graders spent less than an hour on the survey.
8th total: it said 27 8th graders were surveyed so 27 8th graders were surveyed.
8th more: it said 43 students were surveyed more than an hour and that 28 7th graders were surveyed over an hour so you have to subtract 43 by 28, so 43-28=15 so 15 8th graders were surveyed over an hour.
8th less: it said 27 8th graders were surveyed and we found out that 15 8th graders spent over an hour so you have to subtract 27 by 15 so 27-15 is 12 so 12 8th graders spent less than an hour on the survey.
7th and 8th total: it said 46 7th graders were surveyed and that 27 8th graders were surveyed so you have to add 46 and 27, so 46+27=73 so 73 students were surveyed.
7th and 8th more: it said that 43 students were surveyed over an hour so 43 students were surveyed over an hour.
7th and 8th less: we found out that 18 7th graders were surveyed under an hour and 12 8th graders were surveyed under an hour so we have to add 18 and 12, so 12+18=30 so 30 students were surveyed under an hour.
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