it's 36

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it's 36

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By the condition,

(1x) x (3x) x (5x) = 960

or, 15 x3 = 960

or, x3 = 960/15

or, x3 = 64

or,x3 = 4x4x4

or, x= 4

So, the numbers are, 4, 12 and 20

Their sum is = 4+12+20 = 36

a:b:c=1:3:5,abc=960

Let a=x,b=3x,c=5x

x*3x*5x=960

15x^3=960

x^3=960/15

x^3=64

x=(64)^1/3

x=4

therefore,a=x=4

b=3x=12

c=5x=20

hence,a+b+c=4+12+20=36

therefore,their sum is 36......