They both are correct to my knowledge....
Thanks Raksha1 for your help
I check out again the question # 8 and the answer is incorrect
both are correct??? which class are you in?
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Answer 8 is wrong.
The question was: 4/5 of his time is spent on transmission.
That means 4/5 of 25 hours is spent in transmission
So time spent in transmission =  4/5 * 25 = (4*25)/5 = 20 hours
So he spent 20 hours in transmission.

Answer 9 is correct ;)
1 5 1
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Thank you Ezekiel!
Thanks for your help
U r welcome