Question 1134848
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            This problem can be solved in a very easy way,  practically  MENTALLY.


            You only need to choose the major unknown variable by a rational way.



<pre>
Let  x be the money Sandra has (in dollars).


Then Nadine has  3x  dollars  and  Harold has  2*(3x) = 6x dollars.


Together, they have  x + 3x + 6x = 10x dollars, and this amount is exactly  357 dollars.


Hence,  x = {{{357/10}}} = 35.70 dollars.  It is how much Sandra has.


Then Nadine has three times as much, i.e  3*35.70 = 107.10 dollars

and  Harold has twice of it, i.e. 2*107.10 = 214.20.


<U>CHECK</U>.  35.70 + 107.10 + 214.20 = 357  dollars.    ! Correct !
</pre>

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Ideally, &nbsp;each problem you solve in school should teach you something.


Concretely, &nbsp;this given problem teaches you on how to <U>choose the major unknown to make the solution easier</U>.