The sum of  two numbers is 1600.  If  5% of one number is equal to 3% of the other, then the number are

x + y = 1600

5% of x = 3% of Y

5x = 3y

$\frac{x}{y}=\frac{3}{5}$

By options the numbers are 600, 1000

x + y = 1600

x : y = 3 : 5

So ans : 600,1000