Answer:
There were 52 gonjas in thzebedial rally.
There were 78 more fantes than nzemas.
Attached is the pie diagram
Step-by-step explanation:
Given,
Total number of people at the rally = 520
we need to find the number of gonjas at the rally.
Solution,
Firstly we will find out the number of fantes, ewes, nzemas and gas.
According to question, 30% are fantes.
So 30% of total number of people are fantes.
So we can frame it as;
Number of fantes = 
Here we have to convert the percentile,
Number of people who were fantes = 
Also Given:
25% were ewes.
Number of people who were ewes = 
Now Given:
15% were nzemas
Number of people who were nzemas = 
Also Given:
20% were gas
Number of people who were gas = 
Also Given:
the rest of the people were Gonjas
Number of people who were Gonjas = Total number of people attended the rally - Number of people who were ewes - Number of people who were nzemas - Number of people who were fantes - Number of people who were gas.
Number of people who were Gonjas = 520-156-130-78-104 = 52
Hence there were 52 gonjas in thzebedial rally.
Now we will find how many more fantes than nzemas were at the rally.
To find how many more fantes than nzemas were at the rally we will subtract Number of people who were nzemas from Number of people who were fantes.
framing in equation form we get;
more fantes than nzemas = 
Hence there were 78 more fantes than nzemas.