# 99% on 'The World of Math' mission

I have mastered 99% on the world of Math mission (https://www.khanacademy.org/mission/math)

Only one skill is left “Systems of Linear equations word problems: Level 2”. I am stuck on this skill for more than a week. Khan academy doesn’t show me any new questions for this skill. I even practiced twice. Any help! Thank you so much!

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