# Ratio Problem

• Jun 29th 2010, 04:04 AM
haftakhan
Ratio Problem
C had 3 out of 5 of 20 items required to start the school year.What fraction of the number of items he was lacking ?

i get 2/5.Is it right ?
• Jun 29th 2010, 04:26 AM
mr fantastic
Quote:

Originally Posted by haftakhan
C had 3 out of 5 of 20 items required to start the school year.What fraction of the number of items he was lacking ?

i get 2/5.Is it right ?

Yes. (Although the question may well want you to calculate 2/5 of 20 as the answer ....)
• Jun 29th 2010, 04:35 AM
haftakhan
If the ratio of Saturated to unsaturated fatty acids in a cell membrane is 9 to 1 and there are a total of 69 billion fatty acids molecules.How many of them are saturated ?

9/10 *69=62.1 billion.

is it right ?
• Jun 29th 2010, 04:39 AM
mr fantastic
Quote:

Originally Posted by haftakhan
If the ratio of Saturated to unsaturated fatty acids in a cell membrane is 9 to 1 and there are a total of 69 billion fatty acids molecules.How many of them are saturated ?

9/10 *69=62.1 billion.

is it right ?

Yes.