SOLUTION: mother painted 2/5 of a wall white and 3/10 of it blue. a, what fraction of the wall did she paint in all? b, what fraction of the wall had she still to paint?

Question 903706: mother painted 2/5 of a wall white and 3/10 of it blue.
a, what fraction of the wall did she paint in all?
b, what fraction of the wall had she still to paint?
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
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.

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