Answer / naveen

let the three numbers be 2x, 3x ,5x

sum of their squares is to be 4x^2+9x^2+25^2 = 152

then, 38x^2=152

x^2=4
x=2

the sum of the numbers = 2x+3x+5x=2*2+3*2+5*2=4+6+10

=20 (ans)

Answer / jerry

ratio of three numbers is 2:3:5. First add the numbers (as
can be done with any ratio) 2+3+5=10, therefore: let y be
each ratio.

y1/10=x^2/152

y1*(152)/10 = x^2
y1*(15.2)=x^2, the same for the other three numbers in ratio

Now substitute each ratio number:
2*(15.2)=x1^2=30.4, x=(30.4)^1/2 = 5.5136195
to five sigficant digits, now the next numbers in ratio
3*(15.2)=x2=(45.6)^1/2
5*(15.2)=x3=(76)^1/2

X1=5.5136195
X2=6.7527772
X3=8.7177978

What will their sum be?:
X1+X2+X3=5.5136195+6.7527772+8.7177978= 20.9841945

X1^2+X2^2+X3^2=152
also note sum of squares:
(5.5136195)^2+(6.7527772)^2+(8.7177978)^2=152

Also note:
30.4+45.6+76=152 because these are the squares of the above
sum of squares.ex. 30.4 =(5.5136195)^2

also note:
30.4:45.6:76 is the ratio of the X's above
then division by 30.4:
1:1.5:2.5
then multiply by 2:

2:3:5 =>have check answer as requested

Answer / shantha meena

the nos are 2x,3x,5x.

4x^2+9x^2+16x^2=152

38x^2=152

x^2=4

so x=2.

sum=2x+3x+5x
=2*2+3*2+5*2=4+6+10
sum=20.

Answer / raju

good gerry
I appreciate for urs way of thinking

Answer / amit

40

1/(10 power 18) - 1/(10 power 20) = ?

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