Question

the price of an antibiotic in one drugstore is $19.50 and $16.25 in another write the ratio of the prices

Answer 1

Remember that ratios are essentially fractions without fraction bars...

If they asked to find the ration of 19.50 to 16.25 you would set them up like so....

19.50 : 16.25      -----> since fractions can be simplified so can ratios in the same manner

the ratio you would end up with is 6 : 5   

Ratios can be easily remembered and solved if you understand the link between them and fractions. 

I hope this helps! :D

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