Question

the mean of five number is 16.when anumber is added,the mean of six number become21.find the sixth number.​

Answer 1

If the mean of 5 numbers is 16, then the sum of the numbers would be:

16×5= 80 (I have shown how this is possible in attachment)

So now, let the sixth number be x.

(80+x)/6= 21

80+x= 21×6

80+x= 126

X= 126- 80

X= 46

VERIFY:

(80+x)/6= 21

(80+46)/6= 21

126/6= 21

21= 21

LHS= RHS

Hence, verified

Answer 2

Answer:

the total of first five number=16×5=80

Now total number= 21×6=126

6 number= 126-80= 46

answer