Question

5x = 3y= 45z , Prove that 1/z=1/x+2/y

Answer 1

$3y = 45z \\ = > y = 15z \\ = > 1 \div y = 1 \div 15z \\ = > 2 \div y = 2 \div 15z - - - - - - 1 \\ 5x = 45z \\ = > x = 9z \\ = > 1 \div x = 1 \div 9z - - - - - 2 \\ equ1 + equ2 \\ 1 \div x + 2 \div y = 2 \div 15z + 1 \div 9z \\ =23 \div 45z$
hey your question is wrong or my process is wrong