a particle of weight w is attached to two light inextensible strings each of length 40cm. the other ends of the strings are attached to two points on the same horizontal ceiling 64 cm apart. find the tension of the strings in terms of w

so i am trying to solve this resolving forces vertical and horizontal and then equaling them to each other. but its not working out the answer is 5/6 w. i can post my method is people need it