Discussion on Bangladesh Mathematical Olympiad (BdMO) National
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$ABCD$ is a trapezium and $AB$ parallel $CD$.$P,Q,R,S$ are the midpoint of $AB,BD,CD,AC$. $AC$ & $BD$ intersect at $O$.The area of $\triangle AOB=2019$ & $\triangle COD=2020$. Find the area of $PQRS$.
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I don't understand the solution.
How the area of APQD is (3/4)ADB, PBCS is (3/4)ABC, CSR is (1/4)ACD, DQR is (1/4)DBC???
Can you please narrate the solution?