Question

what is the answer of this ques?

Answer 1

$x + y = 20 \: - - - (1)\\ x - y = 25 - - - (2) \\adding \: eqn \: 1 \:and \: 2 \\ x + y + x - y = 20 + 25 \\ 2x = 45 \\ x = 45 \div 2 \\ put \: x = 45 \div 2 \: in \: eqn \: (1 )\\ (45 \div 2) + y = 20 \\ y = 20 - (45 \div 2) \\ y = (40 - 45) \div 2 \\ y = - 5 \div 2 \\ x \div y = (45 \div 2) \div (- 5 \div 2) \\ x \div y = 45 \div (- 5) \\ x \div y = - 9 \div 1$
it means ratio of x/y= -9/1