Math  double check me
posted by Kim .
Kristi joggfed for 3/5 of an hour, swam for 1/2 of an hour, and rode her bicycle for 3/4 of an hour. How long did she exercise?
a. 7/11
b. 9/40
c. 1 17/20
d. 1 7/20
answer: c
Juan owned 3/4 of a family business. He sold 1/3 of the business to his aunt. What portion of the business does he still own?
a. 13/12
b. 5/12
c. 5/13
d. 8/13
answer: b
Estimate the following product
2 1/5 * 4 5/6
a. 8
b. 10
c. 15
d. 18
answer: c

The first two are correct.
there has to be a misprint in the third, since according to your question you are appr. doing 1/5 * 5 which is 1 
The second and third are wrong. There is no correct answer for the second.
2/3 of 3/4 is 1/2 
I believe the problem in the third one is:
2 1/5 * 4 5/6
C is not the correct answer. 
Ms. Sue read it correctly, I don't know how I missed that 2
so it would be appr. 2*5 which would be 10 
the correct answer: B
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