Frank is 12 years younger then John. In 5 years John will be twice as old as Frank. How old will Frank be in four years?
Choose the correct choice from the following answers
A) 8 B) 11 C) 12 D) 14 E) 16
Frank is 15 years younger then John --&gt; F+12=J;   In 5 years John will be twice as old as Frank (in 5 year John will be J+5 years old and Frank will be F+5 years old) --&gt; J+5=2*(F+5) --&gt; (F+12)+5=2*(F+5) --&gt; F=7;   In 4 years Frank will be 7+4= 
<gadget id="calculator">7+4</gadget>
<output>11</output>
11 years old.   Answer: 11.
<result>B</result>
Frank is 12 years younger then John. In 5 years John will be twice as old as Frank. How old will Frank be in four years?