Question

please answer this fast



who will give me step by step answer I will mark him/her brainlist​

Answer 1

Step-by-step explanation:

given,

xy/x+y =20

1/x +1/y = 1/20->(1)

yz/y+z=40

1/y+1/z = 1/40->(2)

zx/z+x =24

1/z+1/x= 1/24->(3)

(1)+(2)+(3)

2(1/x+1/y+1/z) = 6+3+5/120

1/x+1/y+1/z =14/240

so the value of 1/x+1/y+1/z is 7/120