5 th and 6 th Grade Primary 13 th Cyprus Mathematical Olympiad April 2012
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- Aron Merritt
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1 1. How many hours are there in the period from 6:45 am to 11:45 pm in the same day? Α. 5 Β. 17 Γ. 24 Δ. 29 Ε If x is between 1 1 and , then x could equal either of the following except: 5 Α. 1 Β. 5 4 Γ Δ Ε Three times a number less 7 is 32. What is twice the number? Α. 13 Β. 17 Γ. 26 Δ. 32 Ε The average value for the weekly expenses of Andreas, Vasiliki, Georgia and Demetris is 54 euros. The average value for the weekly expenses of Andreas, Vasiliki and Demetris is 57 euros. How much does Georgia spend? Α. 45 Β. 50 Γ. 55 Δ. 56 Ε In the figure below ΑΔ is the bisector of angle Α and ΑΔ=ΔΓ. What is the measure of angle Β? Α. 40 Β. 50 Γ. 60 Δ. 70 Ε. none of these 6. Which of the following numbers is divisible by 2 and 7? Α. 362 Β. 363 Γ. 364 Δ. 365 Ε. 366 Cyprus Mathematical Society Page 1
2 7. From the set of digits {1, 2, 5, 8, 9}, how many odd 3-digit integers can be formed? (Assume that no digit may be used more than once.) Α. 75 Β. 60 Γ. 48 Δ. 36 Ε Which of the following calculations yields the wrong result? Α = Β = Γ = Δ = Ε = If = ψ 1 12 then ψ= Α. 2 Β. 3 Γ. 4 Δ. 5 Ε For χ 0, let χ be defined by χ = χ χ + 1 χ. What is the value of 1 2? Α. 1 5 Β. 1 2 Γ Δ. 2 Ε In the figure below ΑΒΓΔ is a rectangle with ΒΓ=5 cm. Arcs ΑΜΒ and ΔΛΓ are semicircles with diameters ΑΒ and ΔΓ respectively. Μ and Λ are the midpoints of the semicircles ΑΜΒ and ΔΛΓ respectively. The area of triangle ΔΜΓ is: Α. 12,5 cm 2 Β. 25 cm 2 Γ. 50 cm 2 Δ. 100 cm 2 Ε. none of these Cyprus Mathematical Society Page 2
3 12. If Κ= and Λ = Κ then Λ exceeds Κ by: Α. 1 4 Β. 1 8 Γ Δ Ε The following graph represents the distance (in meters) covered by a car in 40 seconds. In which of the following 5 second intervals has the car travelled the longest? m time in seconds Α Β Γ Δ Ε At central High School, the athletic club has 15 members and the music club has 12 members. If a total of 13 students belong to only one of the two clubs, how many students belong to both clubs? Α. 2 Β. 6 Γ. 7 Δ. 12 Ε Which of the following is the largest product? Α. 9,999 9 Β. 999,9 99 Γ. 99, Δ. 9,999 9,999 Ε. 0, ,999 Cyprus Mathematical Society Page 3
4 16. The diagrams below show three scales. How many squares will balance the circle? Α. 3 Β. 4 Γ. 5 Δ. 6 Ε A rectangle has length 25 cm and width 15 cm. If we increase the length by 20% and we decrease the width by 20% then the area of the rectangle is going to Α. increase by 20 cm 2 Β. decrease by 20 cm 2 Γ. be the same as the initial case Δ. increase by 15 cm 2 Ε. decrease by 15 cm The road that connects two cities is uphill. The speed of a motorcyclist is constant and when it s travelling uphill it is by 20 km h less than the speed when travelling downhill. It takes 3 hours for the motorcyclist to travel from one city up to the other and it takes 2 hours to return. What is the distance, in kilometers, between the two cities? Α. 40 Β. 60 Γ. 80 Δ. 100 Ε During a test Constantinos solved correctly 24 out of 25 mathematical problems. In another test he solved twice as many problems but his grade was half the original. How many problems were in the second test? Α. 25 Β. 48 Γ. 50 Δ. 75 Ε. 100 Cyprus Mathematical Society Page 4
5 20. In the figure below find the area of triangle ΑΒΓ. Α Β. 12 Γ. 11 Δ. 9 Ε If the sum of 1 of an even integer and 2 of the next consecutive even integer is equal 2 3 to 27, what is the odd integer between these two even integers? Α. 13 Β. 17 Γ. 23 Δ. 25 Ε In the figure below ΑΒΓΔ is a square with a side of 12 cm. If ΔΕ=3 ΒΕ and ΑΖ=2 ΖΕ, then the area of triangle ΒΖΕ, in cm 2, is: Α. 3 Β. 6 Γ. 8 Δ. 9 Ε. none of these Cyprus Mathematical Society Page 5
6 23. In the figure below the sum of all numbers in any line is the same. Find the value of ω. Α. 5 Β. 17 Γ. 13 Δ. 40 Ε. none of these 24. A number divided by 9 gives a remainder of 8, divided by 8 gives a remainder of 7, divided by 7 gives a remainder of 6 and so on. In the end the number gives a remainder of 1, when divided by 2. Find the number. Α Β Γ Δ Ε. none of these 25. In a box there are 50 white and 40 red balls. Which of the following statements increase the probability of selecting, at random, a red ball? Ι. add another 10 white and another 10 red balls in the box ΙΙ. add another 10 red balls in the box ΙΙΙ. remove 10 white balls from the box IV. remove 10 white and 10 red balls from the box Α. statement Ι Β. statements ΙΙ and ΙΙΙ Γ. statements Ι and ΙV Δ. statements Ι, ΙΙ and ΙΙΙ Ε. none of these Cyprus Mathematical Society Page 6
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