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breannaasmith1122
05.01.2020 •
Mathematics
When a group of students are seated 3 to a bench in an auditorium, 18 are left standing. if they were seated 4 to a bench, 3 benches would be empty. find the number of benches and students
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Ответ:
x = students
b = benches
when 3 are on a bench and 18 are standing the equation is:
x = 3b+18
when 4 are sitting and 3 benches are empty the formula is
and x = 4b-12
so 3b+18 = 4b-12
rearrange to
4b-3b = 18 +12
so b = 30
now plug that into the first formula
x=3(30)+18 = 108
so 108 students and 30 benches
Ответ:
nb knows
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