Question

3 divided by 7 as a fraction of delia is 48, use variable d to represent delia's age

Answer 1

I assume you mean that
3/7 of Delia's age is 48.
That can be written as the equation
(3/7)d = 38

which has as a solution
d = (7/3)*48 = ___

She's a rather old lady.

Answer 2

please write an equation and solve 30 tons of rock at $60 a ton and $84 a tree not to exceed $2500