Electric field and point charges

[Inertialforce]

Homework Statement

The question is as seen on the attachment.

Homework Equations

E = (k)(q)/r^2

The Attempt at a Solution

I know that for this question I am supposed to use the equation "E = (k)(q)/r^2" but the question has me kinda confused. Could someone please tell me what my first step should be in finding the charge on q2?

 

[matt_crouch]

Well you have been given all of the variables except for q2 firstly calculate the distance between q2 and p then rearrange the equation to make q the subject