help Maths

1. Aaron's present age is x.
(a) Jacky age is three times Aaron's. Express, in terms of x, Jacky present age.
(b) Express, in terms of x, Jacky age in 10 years.
(c) Jacky's age will be four times Aaron's present age in 10 years. Write down an
equation involving x.
(d) Sovle the equation in (c). Hence find their present ages.