I learned about this in class today but i am not so good at math so of course i didnt under stand

3/7=a/21

I learned about this in class today but i am not so good at math so of course i didnt under stand

3/7=a/21

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You wrote your question perfectly, Giselle. Now let's think about this together.

For example:

If it take 3 trees to make 7 tables...

Then it takes (a) trees to make 21 tables.

How many trees make 21 tables? Well, if we write that in mathematical terms we see 3/7 = a/21 (3trees per 7 tables, etc...)

Moving each denominator to the other side of the equal sign we get --> 3(21) = 7a

Solve for a.

Rick F. | "Math and Spanish tutor. Fifteen years exp./MEd"Math and Spanish tutor. Fifteen years ...

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## Comments

Thanks really helped