Susan is creating a solution. A formula for the solution calls for 7/10 mL of water. Susan wants to make 2/7 less of the solution than the formula creates.

How much water should Susan use?

Express your answer as a fraction in simplest form.

mL

Question

Susan is creating a solution. A formula for the solution calls for 7/10 mL of water. Susan wants to make 2/7 less of the solution than the formula creates.
 
How much water should Susan use?
 
Express your answer as a fraction in simplest form.
 
 
  mL

agl202 · Answer

@Tears1213 Need help?

anonymous · Answer

yes

agl202 · Answer

First find the greatest common denominator of 10 x 7=?

anonymous · Answer

70

agl202 · Answer

Greatest common denominator is the common number and both 7 and 10 go into in this case it would be 70 right!

agl202 · Answer

So now 7/10 is the same as 49/70 since all you have to do is multiply 7 by both sides and you get 49/70. Same with 2/7 multiply both sides by 10 and you will get?

anonymous · Answer

so like 2*10=20 and 10*7 =70 am i right im really bad at mah science is my thing

agl202 · Answer

Yes, ur right. so, that will make it 20/70

agl202 · Answer

Exactly! So now grab both of the fractions and subtract them...
So
$$\frac{ 49 }{ 70} -\frac{ 20 }{ 70 } =?$$

anonymous · Answer

ok so 49-20= 29
         70-70=0      i failed

agl202 · Answer

Ur numerator is correct, But remember that the denominator has to stay the same. So, u should get: $$\frac{ 29 }{ 70 }$$

anonymous · Answer

ok thxs

agl202 · Answer

Anytime.