In a class average the mark in an exam is 70. The average of students who scored below 60 is 50. The average of students who scored 60 or more is 75. If the total number of students in this class is 20, how many students scored less than 60?

Created: 4 months ago | Updated: 2 months ago
Job Solution Exim Bank Ltd Exim Bank Ltd - Senior Officer - 30.12.2011 গণিত
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solve the equations:
 

x + y = 20 -------- (i)

50x + 75y = 70 x 20​ ------- (ii)

 

So, there are 16 students who scored 60 or more.

 

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