Joan and Karl each bought a sofa and the sum of their purchases was $600. If twice of what Joan paid was $90 more than what Karl paid, what did Joan pay for her sofa?	Choose the correct choice from the following options:  A) $190  B) $210  C) $230  D) $250  E) $270
J+K=600 so K=600-J   2J=K+90   2J=(600-J)+90   3J=690   J=230   The answer is $230.
<result>C</result>
Joan and Karl each bought a sofa and the sum of their purchases was $600. If twice of what Joan paid was $90 more than what Karl paid, what did Joan pay for her sofa?