Canadian Mathematics Competition

1. Pat planned to place patio stone in a rectangular garden that has dimensions 15 m by by 2m. If each patio stones measure 0.5 m by 0.5 m, how many stones are needed to cover the garden ?
A.    240
B.    180
C.    120
D.    60

2.    The prime numbers between 10 and 20 are needed together to form the number Q. What was the larges prime number divisor of Q ?
A.    2
B.    3
C.    5
D.    7

3. The tenth of our planet, earth is covered with land and rest is covered within water. Ninety-seven percent of water is salt water and the rest is fresh water. What is percentage of earth is covered in fresh water ?
A.    20.1%
B.    79.9%
C.    32.1%
D.    2.1%




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