Question 408358
solution:
Let x=the number
    y=the product
    z=the sum

(x)(3) = y     equation 1

x + 30 = z     equation 2

but y = z,  therefore    3x = x + 30

                         3x - x = 30

                         2x     = 30

                          x     = 30/2

                          x     = 15