Age equations
Aaj, kuch saal pehle aur kuch saal baad ki ages ko ek timeline par rakhein. Sum, difference aur age ratio se equation banayein, solve karein aur har condition mein answer check karein.
core level
Preparation level describes the foundations needed to study this topic. It is editorial guidance, not a difficulty score.
What this Topic covers
Elementary age word problems for two people, with stated sums, differences or age multiples at present, past or future times. Includes defining an unknown age or elapsed time, expressing both people's ages consistently, reducing the conditions to one linear equation, solving it and checking whether the answer is determined and physically possible. Age difference stays fixed while age ratio generally changes. Excludes products/squares of ages leading to quadratic equations, large multi-person systems, inequalities, calendar birthday puzzles and ambiguous conventions about 'times older'; these require a different mathematical model or extra wording conventions.