the average weight of a group of persons increased from 48 kg to 51 kg , when two persons weighing 78 kg and 93 kg join the group . find the initial number of members in the group ?
n0 = 48.0
n1 = 51.0
n2 = 78.0
n3 = 93.0
t0 = n2 + n3
t1 = n1 * 2.0
t2 = n1 - n0
t3 = t0 - t1
answer = t3 / t2
print(answer)