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
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.
Ask yourself, what did I do to 7 to get to 21. Answer: Multiply it by 3. So you need to do the same thing to the numerator. 3x3=9. a=9
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Thanks really helped