The sum of three consecutive number is 30 sum of there square is?

M4maths Previous Puzzles

22 Jun 2010 consecutive number

The sum of three consecutive number is 30 sum of there square is?

OPtion

1) 205
2) 29
3) 302
4) 300
5) 149
6) 245
7) 30
8) 900
9) 485
10) 100

Solution

the consecutive numbers are
9 10 11
81 100 121
121 + 100 + 81 = 302

Correct Option: 3 Best Solution (11)

Dolly   14 years AGO

The sum of three consecutive number is 30.


so nos are 9,10,11.
sum of their square is
9^2+10^2+11^2= 302

Like? Yes (2) | No   

Khanna   14 years AGO

if nos are x-1,x and x+1, then
x=10.
(x-1)^2+x^2+(x+1)^2 = 3x^2+2= 3*10^2+2=302

Like? Yes (2) | No   

HARMEET KAUR   14 years AGO

9+10+11=30

9^2+10^2+11^2= 302

Like? Yes (2) | No (1)  

Karthik Pandiyan   14 years AGO

Let x-1,x and x+1 be three consecutive nos
Given that sum=30 hence x-1+x+x+1=30 3x=30
x=10
consecutive numbers are 9,10,11 and sum of squares =81+100+121=302

Like? Yes (2) | No (1)  

Dr.Dipin Singh   14 years AGO

If nos are x-1, x and x+1, then

3x=30 ; x=10.

nos are 9,10,11.

sum of theirv squares = 81+100+121= 302.. option 3

Like? Yes (2) | No (1)  

Roshni Shrivastava   14 years AGO

Three consecutive numbers are 9,10,11

sum of numbers is 9+10+11=30
square of the numbers = 81+100+121
=302
So the Answer will be option 3

Like? Yes (2) | No (1)  

Jagat   14 years AGO

numbers are 9,10,11.

sum of squares = 81+100+121=302

Like? Yes (2) | No (1)  

Mayur   14 years AGO

The sum of three consecutive number is 30.
Average of three numbers is 30/3=10.

so nos are 9,10,11.

9^2+10^2+11^2= 302.. option 3

Like? Yes (2) | No (1)  

leejia james   14 years AGO

30/3=10. so nos are 9,10 and 11. so sum of their squares is 302

Like? Yes (2) | No (1)  

Achelal Sharma   14 years AGO

it 9,10,11 answer is 302

Like? Yes (2) | No (1)  

S. Singh   14 years AGO

The sum of three consecutive number is 30.
Means middle number is 30/3=10.

9+10+11=30

9^2+10^2+11^2= 302.. option 3

Like? Yes (2) | No (2)