Question

The sum of two numbers is 13.1. Their difference is 5.1. Find the two numbers? ( A ) 9.1,4 ( B ) 5,9 ( C ) 6,7.1 ( D ) 8.1,5

Answer 1

$x+y=13.1\\\underline{x-y=5.1}\\2x=18.2\\x=9.1\\\\9.1-y=5.1\\y=4$

9.1 and 4

Answer 2

Answer:  Hi mate!!!

Step-by-step explanation:

Let two no.'s be "x", "y"

x+y = 13.1

  x = 13.1-y                                  ......(i)

    x-y = 5.1

13.1-y-y = 5.1                             .......( Putting value of x from equation (i) )

13.1-2y  = 5.1

     13.1 = 5.1+2y

      2y = 13.1-5.1

      2y = 8.0

        y = 4                          .......(ii)

    x+y = 13.1

x+4 = 13.1                             ..........( Putting value of y from equation (ii) )

         x = 13.1-4

         x = 9.1

Hence option (A) is correct