The average height of 30 boys out of a class of 50 is 160

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The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is :

Average height of whole class =		30 × 160 + 20 × 165		cm
		50

Average height of whole class =		4800 + 3300		cm
		50

Average height of whole class =		8100		cm
		50

Average height of whole class = 162 cm