Question

there are 8 number. average of first 5number is 42 and average of next 3 numbers is 36 .what is the average of all 8 number

Answer 1

step 1, total=42×5
=210
step2, total=36×3
=108
average of 8 number=(210+108)÷8
=318÷8=39.75

Answer 2

Answer:

40

Step-by-step explanation:

Sum of 9 no. = 30×9 = 270

Sum of first five no. = 25×5 = 125

Sum of last three no. = 35×3 = 105

6th no. is = 270 - 125 - 105 = 40