 
<translate> Mgbe Joe gbakwunyere 20% data data na dataset, data data na dataset mụbara site na 20 / 100 * 200 = 40 data data. Ọnụ ọgụgụ zuru ezu nke isi ihe data mụbara ruo 200 + 40 = 240. Ọ bụrụ na ọ belata ihe data site na 1 / 4 nke ngụkọta ihe data, ihe data belatara site na 1 / 4 * 240 = 60. Ọnụ ọgụgụ nke data data fọdụrụ na dataset mgbe Joe belatara data data site na 1 / 4 nke ọnụ ọgụgụ data data bụ 240 - 60 = 180. N'ihi ya, azịza ya bụ 180. <eng> When Joe added 20% more data points to the dataset, the data points in the dataset increased by 20 / 100 * 200 = 40 data points. The total number of data points increased to 200 + 40 = 240. If he reduced the data points by 1 / 4 of the total data points, the data points reduced by 1 / 4 * 240 = 60. The total number of data points left in the dataset after Joe reduced the data points by 1 / 4 of the total data points is 240 - 60 = 180.
Thus, the answer is 180. 