VTMO 2021 — Grade 4 — vtmo Question 6

Question 6

An and Binh buy the same toy. An uses equal numbers of $1$-dollar and $5$-dollar notes; Binh uses equal numbers of $1 - , 2 - , 5$-dollar notes. An uses $10$ fewer notes. How many notes does An use?

$110$
$50$
$60$
$90$
$80$