129.13, I believe.
Hope this helps.
I wasn't taught this specifically, but I would think that it would mean two ratios are involved with the same problem, just like it says.
The Answer is 20. Just take my word for it its 20
30 books = 6 months
In 1 month 30/6= 5
He read 5 books in one month
So, he read 45 books
45/5= 9
<em>He read 45 books/9 months</em>
Answer: B
Step-by-step explanation:
Perimeter = 2(length+width)
'CD' = 20×cos(30) = 17.3205
width 'AD' = 20×cos(60) = 10
Perimeter = 2(17.3205+10)
= 2(27.3205)
= 54.641 =54.6