A class of 35 students has an average height of 180 cm. seven students whose average height is 120 cm, left the class and seven others whose average height is 140 cm, joined. Calculate the new average height of the students of the class (in cm) is?
Choose the correct option.
A) 204.6 cm	B) 404.6 cm	C) 224.6 cm	D) 205.6 cm	E) 256.6 cm
Total height = 180 * 35= 
<gadget id="calculator">180 * 35</gadget>
<output>6_300</output>
6300 cm.   Total height of those who left= 120 * 7= 
<gadget id="calculator">120 * 7</gadget>
<output>840</output>
840   Total height of those who joined= 140 * 7= 
<gadget id="calculator">140 * 7</gadget>
<output>980</output>
980   New average= [6300 - 120 + 980 ] / 35 = 7160/35 cm.   = 204.6 cm   204.6 cmnswer:204.6 cm
<result>A</result>
A class of 35 students has an average height of 180 cm. seven students whose average height is 120 cm, left the class and seven others whose average height is 140 cm, joined. Calculate the new average height of the students of the class (in cm) is?