Any help direction is appreciated.

Question

Inez is putting up decorations for her sister's quinceanera (fifteenth birthday party). She ties three light silk ribbons together to the top of a gateway and hangs from each ribbon a rubber balloon. To include the effects of the gravitational and buoyant forces on it, each balloon can be modeled as a particle of mass m=4.94 g, with its center 54.5 cm from the point of support. To show off the colors of the balloons, Inez rubs the whole surface of each balloon with her woolen scarf, to make them hang separately with gaps between them. The centers of the hanging balloons form a horizontal equilateral triangle with sides 26.0 cm long. What is the common charge each balloon carries?

Answer 1

3*e-8