The average of 30 numbers is 40 and that of other 40 numbers

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The average of 30 numbers is 40 and that of other 40 numbers is 30. The average of all the numbers is

∴ Average of all numbers =	30 × 40 + 40 × 30
	70

Average of all numbers =	240
	7

Average of all numbers = 34	2
	7

Second method to find the required average ,
Here, n₁ = 30, a₁ = 40
n₂ = 40, a₂ = 30

∴ Average =	n₁a₁ + n₂a₂
	n₁ + n₂

∴ Average =	30 × 40 + 40 × 30
	70

Average =	240
	7

Average = 34	2
	7