1.

on a particular day 2 by 15 of the total were absent. If 1950 were present on that day, find the total strength of school

Answer»

2 by 15 of the total were absent means 13 by 15 were present in the school.
In the given question the no. of present students is given that is 1950 
Means there are 15 total PARTS out of which 2 parts students are absent and 13 parts students are present
Let the total no. of the students be x
So we can use DIRECT variation for this,
Parts         No. of students 
  13              1950
   15                 x
∴13×x=1950×15
∴x=1950×15÷13
∴x=2250
So the  total no. of students are 2250.


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