University of Waterloo Logo and CEMC Banner

2023 Beaver Computing Challenge
(Grade 7 & 8)

Questions


Part A

Lakes

Story

Six lakes are connected by rivers. Water always flows from a lake with a greater height above sea level to a lake with a lesser height above sea level.

An online search provides the following information about these lakes:

Lake pH Level Height Above Sea Level (m) Estimated Fish Population
Atlyn 6.5 320 32000
Clare 7.1 740 1500
Doffin 6.8 490 65000
Kazba 7.2 673 4200
Mus 6.5 973 22100
Soul 6.2 382 43000

Question

In what order does water flow between these six lakes?

  1. Atlyn, Clare, Doffin, Kazba, Mus, Soul
  2. Mus, Clare, Soul, Atlyn, Doffin, Kazba
  3. Kazba, Clare, Doffin, Mus, Atlyn, Soul
  4. Mus, Clare, Kazba, Doffin, Soul, Atlyn

Ogham Code

Story

Ogham is a medieval alphabet used to write words vertically along a pillar.

Each letter is represented by a group of lines that always touches or crosses the pillar in the same way. Groups (letters) are separated by big gaps and arranged upwards from the bottom of the pillar to the top of the pillar.

Eabha writes four words using the Ogham alphabet as shown. The words are BANANAS, BERRIES, LETTUCE, and ORANGES, but we do not know which word corresponds to which image.

A description of the diagram follows.

Question

From left to right, what is the order in which Eabha has written these words?

  1. LETTUCE, ORANGES, BANANAS, BERRIES
  2. ORANGES, LETTUCE, BANANAS, BERRIES
  3. BERRIES, BANANAS, LETTUCE, ORANGES
  4. LETTUCE, ORANGES, BERRIES, BANANAS

Flower Shop

Story

A florist makes bouquets by following these three steps in order:

  1. Pick one flower from the bucket shown on the left to start the bouquet.

  2. If the flower picked is a daisy , add a second daisy to the bouquet.

  3. Complete the bouquet by adding at least one branch of leaves from the bucket shown on the right.

The bucket on the left has two roses and two daisies. The bucket on the right has three branches of leaves.

Question

Which bouquet might the florist make?


  1. One daisy and two branches of leaves.

  2. Two roses and one branch of leaves.

  3. Two daisies and one branch of leaves.