Khan Academy Bookmarklet that is meant to automatically answer your current question correctly. Simply copy and paste this code into a new bookmark.

khan_marklet.js

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javascript:

/* Build URI endpoint for Khan API */

var url="/api/v1/user/exercises/"+userExercise.exercise+"/problems/"+(userExercise.total_done+1)+"/attempt";

/* Slowly, but surely, collecting the data for a successfull API call */

var data={

	complete:1,

	count_hints:0,

	time_taken:Math.floor(Math.random()*10),

	attempt_number:userExercise.total_done+1,

attempt_content:777, /* <-- Need to find the correct answer */

	sha1:userExercise.exercise_model.sha1,

	seed:KhanUtil.getPrime(), /* <-- Need to find correct seed for current problem */

problem_type:0

};

/* Ping the Mothership */

$.post(url,data);