Question

the average of 30 number is 40 and other 40 number is 30. the average of total number

Answer 1

Find the sum of the 30 numbers:

Average = 40

Sum = 40 x 30 = 1200

Find the sum of the other 40 numbers:

Average = 30

Sum = 30 x 40 = 1200

Find the sum of all the 70 numbers:

Sum = 1200 + 1200 = 2400

Find the average of the 70 numbers:

Sum = 2400

Average = 2400 ÷ 70 = 34.3

Answer: the average of the 70 numbers is 34.3