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Answer 1 · 2016-12-31T14:58:58

$2 1/2:1$ is the same as $5" ":" "2$

This is the ratio $2 1/2 : 1$ which can also be written as $2.5 :1$

However, both of these forms are not written in correct ratio form which only uses whole numbers.

$2 1/2 : 1$ can be written as $5/2 : 1$

Multiplying both sides by 2 will solve the problem of the $1/2$

$5/2 xx2 " ":" " 1 xx2$

gives the ratio $" "5" " :" "2$

For the decimal, multiplying by 10 will get rid of the decimal.

$2.5 xx 10" " :" " 1 xx10$

$25 " ":" " 10" "larr$ divide both by 5

$5" ":" "2$ is the ratio