In an orchard of apple and peach trees, 3/7 of the trees are peaches. What is the ratio of apple trees to peach trees?

To find the inverse of a number a, one can use the equation f(c) = a-1/c=0 where c is the inverse of a use the secant method of finding roots of equations to find the inverse of a = 2.5 ,er = 0.001%