Question 903706
in order to add fractions together, you need to get a common denominator.


your denominators are 5 and 10.


multiples of 5 are 5,10,15,20,...
multiples of 10 are 10,20,30,...


it appears that 10 is the least common multiple ot 5 and 10, so we'll use that.


2/5 * 2/2 = 4/10


now you can add the fractions together because they have a common denominator.


4/10 + 3/10 = 7/10


she painted 7/10 of the wall in total.


she still needs to paint 1 - 7/10 of the wall.


once again, you need common denominators.


1 * 10/10 = 10/10


the equation becomes:


10/10 - 7/10 = 3/10 of the wall that still needs to be painted.