Library / /92 of 183

, 2026

Algebra Difficulty 1.4 Junior Find the answer Canada

Riley is $3$ years older than
Elsa. The sum of their ages is $27$ .
How old is Elsa?

Pick one

Solution

We seek two positive integers that differ by $3$ and whose sum is $27$ . With a small amount of trial and
error, we determine that $15-12=3$
and $15+12=27$ , and so Elsa is $12$ .

Want a route through all this instead of an archive? The track puts 2,444 problems in a working order, from Junior Challenge level to the IMO shortlist.

Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project.