Question

Jessie colered a poster. She colered 2/5

Answer 1

Only you have to multiply by a number the numerator and denominator.
2n/5n;  n∈N (N=1,2,3,....;)
Therefore:
if n=2 ⇒2*2/5*2=4/10
if n=3 ⇒2*3/5*3=6/15
if n=4 ⇒2*4/5*4=8/20...

therefore, 4/10 ,6/15, 8/20