Three friends each have some ribbons. Carl has 90 inches of ribbons, Tino has 10.5 feet of ribbon, and Baxter has 2.5 yards of ribbon. Express the total length of ribbon the three friends have in inches, feet, and yards.

What I need:
Instructions on how to do this because I don't get it, well I read it three times but couldn't get it.
I don't need answers because I want to learn it by myself to see how to do it next time when I come across with a problem like this.

*Reminder*
If you want to give me the answers instead of instructions then its fine. But, it will be more appreciated if you don't give me answers and give instructions.

Thank you for understanding and helping!

3 answers

1 foot = 12 inches
1 yard = 36 inches = 3 feet

thank you gracias

De nada.