Answer:
9/5
Explanation:
original fraction : x/y
new fraction = .9x/(.5y)
= 9x/5y
(9x/5y) / (x/y)
= 9x/5y * y/x
= 9/5
= 1.8
so it increased by 80%
e.g suppose we had 100/200 or 1/2
new fraction = 90/100 or 9/10
new ratio = (9/10) / (1/2)
= 9/5
1 to 6
<span>
Read more at http://www.crackact.com/act/math/question-175-answer-and-explanation.html#meW66CYbSBhol9Ry.99</span>
They always show evolutionary relationships of organisms.