So i have this homework exercise from electrostatic that my teacher said he can upgrade my grade if i solve it

so this is kinda tricky cus i searched everywhere for similar exercises and nothing was alike .. so i chose to come here :) .. this is not written in englisht so ill try to translate it as good as i can

1. Two small spheres with the same (equal) radius and mass are hanged on wires with the same (equal) length , in which in air are hanged on one point . After the load on the spheres with electricity q = 40x10­­­­­­ˉ¹ºC the wires will move reciprocally in a angle 60⁰ . Define the mass of the sphere , if the length of the wire is 20cm .

(m=6.0 10­­­­­­ˉ³kg)

where im stuck is that i know the force of Culon and the Force of gravity , i know the universal constant of gravity and the constant of electricy on air but how to find the mass im not even near it .. i found some similar exercises on youtube id say with two spheres but none of them had an angle given ... reddit is my last resort 😖

P.S i have to explain it as well on the board