Explanation:
Blank C :
Given total = 68
No. of TV news = 13
Therefore, in Internet it would be = Total - TV news
= 68 - 13 = 55 (ans)
Blank D :
No. of Internet news in 7th grade = 55
No. of Internet news in 8th grade = 64
Hence, total Internet base news = 64 + 55 = 119 (ans)
Blank B :
All total = 138
Internet news total = 119
Hence, TV news total = All total - Internet news
= 138 - 119 = 19 (ans)
Blank A :
No. of TV news in 7th grade = 13
Total news in TV = 19
Therefore, no. of TV news in 8th grade = 19 - 13 = 6(ans)
Blank E :
All total = 138
Total of 7th grade news = 68
Hence, total of 8th grade news = 138 - 68
= 70 (ans)