Question 179958
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In a word, no.


What you suggest would be finding, in effect, the value representing 70% of 28. (even though you converted the wrong number to a decimal) Not the same question at all.  Besides, the result of multiplying 28 by .7 is 19.6, and where would one find .6 of a student, some students' poor study habits notwithstanding?  Still another sanity check is that if 28 is 70% of something, then that something has to be larger than 28.


The question says:  28 is 70% of what?  That means that you are looking for a value that when multiplied by 70% or 0.70 results in 28.  A good placeholder for an "I don't know what" is <i>x</i>.  So we need to translate the english sentence "70% of a value I don't know is 28" into algebraic symbols.


'70%' means 0.70


'of' means multiply


'a value I don't know' means <i>x</i>


'is' means =


and 28 means 28


Therefore:


*[tex \Large 0.70x = 28]


Now, in order to get <i>x</i> by itself on the left so that we know its value, we need to divide by 0.70


*[tex \Large x = 40]



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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