Who is asking: Parent

Level: Elementary

Question:

12/36=?/18=4/?=?/9

Help.

Hi,
Compare the fractions

^{12}/_{36} and ^{?}/_{18}.
The denominator of the fraction on the left is twice the denominator of the fraction on the right.
(36 = 218)
and hence the numerator on the left should be twice the numerator on the right. That is 12 should be twice the value of ?. Thus ? = 6.
Now compare

^{12}/_{36} and ^{4}/_{?}.
This time the numerator on the left is 3 times the numerator on the right so the denominators should be related by the same factor. That is 36 should be 3 times the value of ?. Thus ? = 12.
Can you now see what to do with ^{12}/_{36} and ^{?}/_{9}?

Penny