SOLUTION: A class consisted of 14 boys and 19 girls. On a certain day all the boys was present and some girls were absent, so that the girls present made up only 30% of the class attendance.

Question 305676: A class consisted of 14 boys and 19 girls. On a certain day all the boys was present and some girls were absent, so that the girls present made up only 30% of the class attendance. How many girls were absent?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A class consisted of 14 boys and 19 girls.
On a certain day all the boys was present and some girls were absent, so that
the girls present made up only 30% of the class attendance.
How many girls were absent?
:
Let a = no. of girls absent
:
Total in the class: 14 + 19 = 33 students
then
(33-a) = total in the class on that certain day
:
= .30
19 - a = .30(33-a)
19 - a = 9.9 - .3a
19 - 9.9 = a - .3a
9.1 = .7a
a =
a = 13 girls absent
:
:
See if that makes sense
Total in class that day: 33-13 = 20
Girls in the class that day: 19-13 = 6
= .3 (30%)
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