# Examples for 8th grade - page 67

1. Clock Tower What angle is betwenn hands on Clock Tower when show 17 hours and 35 minutes?
2. Two numbers Determine the numbers x and y so x + y = 8 is truth and the numbers are in the ratio of 4: 5.
3. Average mark Calculate average mark in English, if a student got a couple of 3's, 20% less 2 than 3, and 50% more 1's than the 2's.
4. Vacation Smiths paid a deposit for a vacation of two-sevenths of the total price of the vacation. Then paid also € 550. How much cost their vacation?
5. Is equal Is equal following terms? ?
6. Fe vs. H2O The volume of what the body of the same weight is greater - iron or water?
7. Annulus Calculate the area of two circles annulus k1 (S, 3 cm) and k2 (S, 5 cm).
8. Shop stores Workers untied fruit to stores. In the first quarter shipments, in the second fifth shipment, in the third two-fifths of the rest and in the fourth 231 kilograms. How many fruits were together?
9. Unions now The plant has 1,250 employees. The Trade Unions (former ROH, OH) is 18% male, 23% female. Plant management reported that in the trade union is 20% of all employees. How many men and women are in plant and how many are men and women in trade unions?
10. Triangle Determine whether a triangle can be formed with the given side lengths. If so, use Heron's formula to find the area of the triangle. a = 158 b = 185 c = 201
11. Math heart Stylized heart shape created from a square with side 5 cm and two semicircles over his sides. Calculate the content area and its circumference. What is greater angle? -0.7 radians or -0.7π radians? What will be hexadecimal number 303 as decimal number?
14. Copper wire What is the weight of 1000 m copper wire with a diameter of 5 mm when rezistivity p = 8.8 g / cm3?
15. Pigs Pigs are feed by beet.Beet feed containing 12% dry solids, which is 0.72% of digestible crude protein. How much beet must beconsumed in one month (30 days), if the weight of digestible crude protein contained in a daily dose of beet was 0.912 kg?
16. Isosceles trapezoid v3 In an isosceles trapezoid ABCD is the size of the angle β = 81° Determine size of angles α, γ and δ.
17. Pages of book Lenka calculated that if every day to read 16 pages of the book, read a book a day earlier than had read only 14 pages a day. How many pages has this book?
18. Cuboid box How many m2 paper is needed for the sticking cuboid box of dimensions 50 cm, 40 cm and 30 cm? To the folds add one-tenth the area.
19. Testing Students of high school have 10 points for each good solved task. The wrong answer is deducted by 5 points. After solving 20 tasks, student Michael had 80 points. How many tasks did he solve correctly and how many wrong?
20. Water lake The length of the lake water is 8 meters width 7 meters and depth 120 centimeters. How many liters of water can fit into the water lake?

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