There are 20 students with an average height of 105 cms in a class. Then 10 students with an average height of 120 cms join the class. What will be the average height of the class now?	Choose one
A) 110 cms  B) 120 cms  C) 100 cms  D) 115 cms  E) 130 cms
20 students average height is 105cms   sum of heights/ 20 =105cms   sum of heights of 20 students= 105*20= 
<gadget id="calculator">105*20</gadget>
<output>2_100</output>
2100   10 students of average height 120 added   so their, sum of 10 students height / 10= 120   sum of heights of 10 students = 1200cms   By adding heights of 20 and 10 students , 1200+2100 = 3300   average of 30 students = 3300/30= 
<gadget id="calculator">3300/30</gadget>
<output>110</output>
110 cms   110 cmsNSWER:110 cms
<result>A</result>
There are 20 students with an average height of 105 cms in a class. Then 10 students with an average height of 120 cms join the class. What will be the average height of the class now?