HKDSE-MATH - 2019 - Paper 1 -

Ans: B
$\left\{ \begin{array}{ll}
6x – 7y = 40 &

Ans: $416$
Let $x$ and $y$ be the numbers of male and female ap

Ans: $48$
Let $x$ and $y$ be the number of stickers owned by th

Ans: $57$

$\left\{ \begin{array}{l}
x+y =456 & \ldot

Ans: $35$

Let $x$ and $y$ be the number of male and female pass