The average height of 50 pupils in a class is 150 cm. Five of them whose height is 146 cm, leave the class and five others whose average height is 156 cm, join. The new average height of the pupils of the class (in cm) is ?	Pick:
A) 287 cm B) 151 cm C) 276 cm D) 287 cm E) 297 cm
Total height = 150 * 50= 
<gadget id="calculator">150 * 50</gadget>
<output>7_500</output>
7500 cm.   New average= [7500 - 5 * 146 + 5 * 156 ] / 50   = 151 cm.   Answer:151 cm
<result>B</result>
The average height of 50 pupils in a class is 150 cm. Five of them whose height is 146 cm, leave the class and five others whose average height is 156 cm, join. The new average height of the pupils of the class (in cm) is ?