Maths Olympiad Prep

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, 2025

Algebra Difficulty 1.3 Junior Find the answer Canada

Rachel, Christophe and Alfonzo are paid to organize some books.
In total, they are paid $50\$50.
Alfonzo is paid $14\$14. Rachel is
paid twice what Christophe is paid. How much is Christophe paid?

Pick one

Solutions — 2

Solution 1

Alfonzo is paid $14\$14 of the
$50\$50. Together, Rachel and
Christophe are paid $50$14=$36\$50-\$14=\$36.

Rachel is paid twice what Christophe is paid, and so Rachel is paid
23\frac23 of $36\$36 and Christophe is paid 13\frac13 of $36\$36.

Thus, Christophe is paid 13×$36=$12\frac13\times\$36=\$12.

Solution 2

In total, Rachel, Christophe and Alfonzo are paid $50\$50. Since Alfonzo is paid $14\$14, then in total, Rachel and
Christophe are paid $50$14=$36\$50-\$14=\$36.
Rachel is paid twice what Christophe is paid, and so Rachel is paid
23\dfrac23 of $36\$36 and Christophe is paid 13\dfrac13 of $36\$36, or $363=$12\dfrac{\$36}{3}=\$12.

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