wow
Level I
1) In 1976 Marcelo was 11 years old. How old will he be in 1999?
2) If 13 bullets cost $3.90, how much do 31 bullets cost?
3) A box measures 60 cm x 50 cm x 30 cm. What is the maximum number of smaller boxes measuring 10 cm x 10 cm x 10 cm that fit in it?
4) 12 people do a job in 12 days. How many people are needed to do the same job in 1 day?
5) A collection consists of 12 volumes. There are 300 pages in each volume, 50 lines on each page, and 100 letters on each line. What is the total number of letters in the collection?
Level II
6) A company has enough stock to supply its clientele of 2,500 people for 12 months. How long would this stock last if the clientele grew to 6,000 people?
7) If one horse can pull 600 kg, how many horses are needed to pull 6,150 kg?
Fernanda’s and Andreia’s ages total 18 years. What are their individual ages, given that Andreia is twice as old as Fernanda?
ok so far it is easty, lets skip to the later levels:
Level VI
21) Several rectangles are drawn on a plane surface in such a way that their intersecting lines form 18,769 areas not further subdivided. What is the minimum number of rectangles that must be drawn to form the described pattern?
22) Several straight line segments are drawn on a plane surface in such a way that their intersecting lines form 1,597 areas that are not further subdivided. What is the minimum number of line segments that must be drawn to form the described pattern?
23) 1 + 10^1,234,567,890 triangles are drawn on a plane surface. What is the maximum number of areas, not further subdivided, that can be formed as these triangles intersect each other?
Level VIII
30) The porous and gray “lead†inside a pencil consists of a mixture of graphite and clay. The ratio of graphite to clay is not known. On writing on a sheet of paper, a fine layer of “lead†remains on the surface of the sheet. Describe a method for calculating the mass of “lead†in the dot of the letter “iâ€. You may use only US$10 to buy the material needed for the experiment.
Level IX
33) Describe a practical and fast method that can be used with good precision to determine the number of words in a person’s vocabulary.
