Mathematics
ashleymonkey373
30

The answer to this question 180, but how? One day 10% of the students enrolled in the school were absent, There were 1620 student present on that day. How may students were absent. I know you have to figure what percent of the students were present.

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karla519

I'm going to show you two ways to do it. Way #1 is the slogging way. Way #2 is the clever way. Way #1: ' One hundred percent ' means ALL of something. ALL of the students in the school is the same as 100% of them. If 10% are absent, then 90% are present. 90% means  0.9  .                                1620 students  =  90% of the school.                                             1620  =  0.9 x school total Divide each side by 0.9:     1620/0.9 = total school                                              1800  =  total school How many were absent ?  10% of them.  10%  means  0.10  .                          0.10  x  1800  =  180 students absent . _______________________________________ Way #2: ' One hundred percent ' means ALL of something. ALL of the students in the school is the same as 100% of them. ==> If 10% are absent, then 90% are present. ==> The number of students present is  9 times  the number who are absent.                                             1620 = 9 x the number absent Divide each side by  9 :    1620 / 9  =    the number absent                                        1620 / 9  =  180 absent .

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