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This morning James had half as much money as his brother and 27 dollars less than his sister. Then his brother paid James and his sister each 12 dollars not to tell their parents what happened out in the garden last Wednesday. After the payoff, James's sister has twice as much money as James's brother. How much money does James have now?

 Mar 25, 2016
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This morning:

     James had  x  dollars

     Brother had  2x  dollars (so James had half as much as his brother)

     Sister had  x + 27 dollars (so James had 27 dollars less than his sister).

 

His brother paid  12  dollars to James; now James has  x + 12  dollars.

His brother paid  12  dollars to his sister; now his sister has  x + 27 + 12  =  x + 39  dollars.

After paying  12  dollars to both James and his sister, his brother now has  2x - 12 - 12  =  2x - 24  dollars.

 

James sister now has twice as much money as his brother:  sister  =  2 x brother     --->   x + 39  =  2(2x - 24)

     --->     x + 39  =  4x - 48

     --->     39 + 48  =  4x - x

     --->     87  =  3x

     --->     x  =  29

 

James now has $29.00 + $12,00  =  $41.00. 

 Mar 25, 2016

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