Question

Write the ratio in lowest terms.  20:14
a. (7/10)
b. (20/14)
c. (14/20)
d. (10/7)

Answer 1

to get a ratio in lowest terms, you have to divide both sides by the same number.  what number fits into both?  2 does.  so 20/2=10, and 14/2=7.  this means that (d) is correct.
does that help?

Answer 2

when putting ratios, fractions, expressions, etc into lowest terms you take out the gcf.

in this case the gcf of both 20 and 14 is 2.

20/2:14/2 = 10:7

the answer is d