Question

i forgot how to find equivalent fractions. i know that the bottom would be times by 3 to get 18 but if you times 3 by 3 it would make nine , and neither nine or 3 are in the same times table as 20 . so im confused.

Answer 1

$\frac{3}{6} = \frac{9}{18} = \frac{20}{40}$
if you look closely, 3/6 is equivalent to 1/2, so from that we can infer that the question is asking for 1/2 equivalents; for example, 9 is half of 18 and 20 is half of 40.

Answer 2

Set up a proportion.  take 3/6 = 20/x
Cross multiply 3 * x = 6 * 20
Simplify  3x = 120
Divide by 3  x = 40
So the denominator of the bottom fraction is 40