Jo's collection contains US, Indian and British stamps. If the ratio of US to Indian stamps is 5 to 2 and the ratio of Indian to British stamps is 5 to 1, what is the ratio of US to British stamps?
Do you guys have any idea how to solve it?
You can write the fractions....
$\displaystyle \displaystyle\frac{US}{IN}=\frac{5}{2}$
$\displaystyle \displaystyle\frac{IN}{BR}=\frac{5}{1}$
We want $\displaystyle \displaystyle\frac{US}{BR}$
Notice that..
$\displaystyle \displaystyle\frac{US}{IN}\ \frac{IN}{BR}=\frac{US}{BR}$