2021 CIME I Problems

Revision as of 20:01, 10 January 2021 by Sugar rush (talk | contribs) (incomplete problems)
2021 CIME I (ProblemsAnswer KeyResources)
Preceded by
[[2021 CIME I Problems/Problem {{{num-b}}}|Problem {{{num-b}}}]]
Followed by
[[2021 CIME I Problems/Problem {{{num-a}}}|Problem {{{num-a}}}]]
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
All CIME Problems and Solutions

Problem 1

Let $ABCD$ be a square. Points $P$ and $Q$ are on sides $AB$ and $CD,$ respectively$,$ such that the areas of quadrilaterals $APQD$ and $BPQC$ are $20$ and $21,$ respectively. Given that $\tfrac{AP}{BP}=2,$ then $\tfrac{DQ}{CQ}=\tfrac{a}{b},$ where $a$ and $b$ are relatively prime positive integers. Find $a+b$.

Problem 2

For digits $a, b, c,$ with $a\neq 0,$ the positive integer $N$ can be written as $\underline{a}\underline{a}\underline{b}\underline{b}$ in base $9,$ and $\underline{a}\underline{a}\underline{b}\underline{b}\underline{c}$ in base $5$. Find the base-$10$ representation of $N$.