Dart
Probability
Level
1
A square game board has red and blue stripes of equal width as shown in the figure above. What is the chance that a dart that strikes the board will land on a blue stripe? Give your answer as a decimal number.
The answer is 0.6.
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1 solution
Since the stripes are of equal width, we divide the square game board into smaller squares as shown. There are a total of
5
2
=
2
5
congruent small squares. Therea are
1
5
blue small squares, so the chance that a dart will land on blue stripe is
2
5
1
5
=
0
.
6