Math, asked by manojdmadhav6763, 10 days ago

The mean of seven number is 15 when three numbers is added, the mean of the ten numbers is 12. Find the three numbers

Answers

Answered by ghanashriurkude2005
6

Answer:

Given:

1) mean of 7 numbers is 15

after adding 3 numbers to it

2)mean of 10 numbers  is 12

let us assume  that three numbers as a,b and c

also let x be the sum of that first 7 numbers

mean=sum of all numbers /number of given numbers

15=x/7

15x7=x

x=105

Now, let us go to second case

mean=sum of numbers/number of numbers

12=x+a+b+c/10

12=105+a+b+c/10

12x10=105+a+b+c

120=105+a+b+c

120-105=a+b+c

15=a+b+c

so,

a=5

b=5 and

c=5

THANK U

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