" (i) If "x%" of "y" is "13x," then find the value of "y

If x% of 2000 = 600, then find the value of x.

If x% of 350 is 21, find the value of x.

If x/y=13/6 then find the value of (3x+5y)/(3x-5y)

If 3x + 5y = 21 and 2x +3y = 13 , then find the values of x and y .

If the solution of pair of linear equation 2x - 3y = 13 and 7x - 2y = 20 is x = 2 and y = - 3, then find the value of m for which y = mx + 7.