MathDB

Maisy is at the origin of the coordinate plane. On her first step, she moves

1

unit up. On her second step, she moves

1

unit to the right. On her third step, she moves

2

units up. On her fourth step, she moves

2

units to the right. She repeats this pattern with each odd-numbered step being

1

unit more than the previous step. Given that the point that Maisy lands on after her

21

st step can be written in the form

(x, y)

, find the value of

x + y

.
Proposed by Audrey Chun

B6