Joan and Karl each bought a TV and the sum of their purchases was $500. If twice of what Joan paid was $40 more than what Karl paid, what did Joan pay for her TV? Choose the correct choice from the following answers.
A) $165 B) $170 C) $175 D) $180 E) $185
J+K=500 so K=500-J   2J=K+40   2J=(500-J)+40   3J=540   J=180   The answer is $180.
<result>D</result>
Joan and Karl each bought a TV and the sum of their purchases was $500. If twice of what Joan paid was $40 more than what Karl paid, what did Joan pay for her TV?