Unit 6 · Algebra
m+12 = 3(m−2) — How Old Is Marco Now?
Lesson 3 of 12
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About this lesson
Age problems are one of the most satisfying question types in OC MR algebra: a single variable for the current age unlocks every time-shifted condition in the question. Students who try to guess using the answer options lose time; students who introduce one letter and write the equation solve in under 90 seconds.
Chapters
0:00Introduction
0:25The Question
0:53Defining the Variable and the Future
1:17Defining the Past and Building the Equation
1:43Solving the Algebra
2:16Confirming the Answer
2:39Correct answer
Question
In 12 years, Marco's age will be 3 times his age 2 years ago. How old is Marco now?
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