%% try also font-size 14pt
\documentclass[fleqn,14pt,a4paper,twoside]{extarticle}
%% extra space in between of the binded pages:
\usepackage[tmargin=4cm,bmargin=4cm,lmargin=2cm,rmargin=2cm,asymmetric,headheight=50pt,bindingoffset=1cm]{geometry}
%\usepackage[tmargin=4cm,bmargin=4cm,lmargin=2cm,rmargin=2cm,headheight=50pt]{geometry}
\usepackage[sc]{mathpazo}
\linespread{1.05}
\usepackage[T1]{fontenc}
\usepackage{microtype}
\usepackage{amsmath,amssymb}
\usepackage{xspace}
\usepackage{xcolor}
\usepackage{graphicx,wrapfig}
\usepackage{parskip}
\usepackage{afterpage}
\usepackage{url}
\usepackage{fancyhdr}
\usepackage{emptypage}
\fancyhead{}
\fancyfoot{}
\fancyhead[LE,RO]{\includegraphics [width=.5\textwidth] {logo.pdf}}
\fancyfoot[LE,RO]{\thepage}
\pagestyle{fancy}
\newtheorem{theorem}{Theorem}
\newtheorem{lemma}{Lemma}
\newtheorem{definition}{Definition}
\newtheorem{example}{Example}
\newtheorem{question}{Question}
\newtheorem{exercise}{Exercise}
\newtheorem{remark}{Remark}
\usepackage{etoolbox}
\patchcmd{\thebibliography}{\section*}{\paragraph}{}{}
\usepackage{titlesec}
\titleformat{\section}{\normalfont\LARGE\bfseries}{Problem \thesection}{1em}{}
\newcommand{\problem}[3][\defaultopt]{
\def\defaultopt{#2}
\section[#1]{#2} \vspace{-\baselineskip} {\it suggested by #3} \vspace{\baselineskip}
}
\usepackage{chngcntr}
\counterwithin*{theorem}{section}
\counterwithin*{lemma}{section}
\counterwithin*{definition}{section}
\counterwithin*{example}{section}
\counterwithin*{question}{section}
\counterwithin*{exercise}{section}
\counterwithin*{remark}{section}
\counterwithin*{figure}{section}
\title{\Huge Open Problems \vfill}
\author{}%do not fill this in
\date{27 Feb--31 Feb, 2020}
\newcommand{\defparproblem}[3]{
\vspace{1mm}
\noindent\fbox{
\begin{minipage}{0.95\textwidth}
\textsc{#1} \\
{\bf{Input:}} #2 \\
{\bf{Question:}} #3
\end{minipage}
}
\vspace{1mm}
}
\graphicspath{{./figures/}}
\begin{document}
\input{aga-yourname}
\end{document}
