Question

help i suck at frations. gens aquarium tank is 2/3 filled
she adds water until it is 9/10 filled
what part of a tank of water did she add
a 7/7
b3/10
7/30
d18/30
e none of these

Answer 1

You need to subtract:
9/10 - 2/3
First, you need a common denominator.

Answer 2

the lcd (least common denominator) is what? 10*3? 3*10?

Answer 3

then you will need to multiply the top number of the fractions by the same as the bottom

Answer 4

for the bottom is it 3*10?

Answer 5

Yes

Answer 6

yes. so it will be 27/30 and 20/30

Answer 7

after you do that, you will want to subtract it in the order i put it above^

Answer 8

so 27-20 which leaves you with what?