National Math Trail

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National Math Trail

• Math / BSS Project
• Marcella Ceva, Julia Heringer, Manuella Maya e
  Janaina Richardson

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Farol da Barra
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The History of Farol da Barra

• In 1698, the 1st bronze and steel Lighthouse was
  installed on the Fort of Santo Antonio, in
  Salvador, Bahia. D. João de Lencastro built this
  fort two years before, and formerly it was
  powered by whale oil. The lighthouse is located
  on a cement tower on top of the Santo Antônio
  fort, situated 124 feet above sea level. The
  tower of Farol da Barra was incorporated in 1796,
  and last modified in 1899, modification that gave
  the lighthouse its actual appearance.
• With a maximum reach of 18 miles in a good
  weather, the lighthouse has a function of
  orienting the coast, to protect arriving boats.
  In 1888 a new European light system was bought,
  and inaugurated in 1890. Its light flashes one
  white and one red flash each ten seconds. In 1937
  the lighthouse received an electric powered light
  system, and in 1956 a new system of rotation.
  Farol da Barras third light system was produced
  in England ad installed on D. Pedro IIs
  birthday, 2/12/1839. Todays lighthouse was
  installed in 1890, having an actual length of 22
  meters and height of 39 meters above sea level.
  Its light reaches up to 38 miles.

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Problem

• Last week, 70 students came from Melbourne,
  Australia to Salvador - Brazil. They divided
  themselves into groups and some visited Farol da
  Barra.
• Knowing that
•         3 students visited Farol da Barra the 3
  days
•         10 students visited on Friday and
  Saturday
•         20 students visited on Friday and
  Sunday
•         13 students visited on Saturday and
  Sunday
•         and in total, 30 students visited on
  Friday, Saturday and Sunday
• How many tourists visited Farol da Barra? How
  Many did not visit it?

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(No Transcript)
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Solution

•   
• As 3 students visited the 3 days w 3

• As 10 students visited on Friday and Saturday y
  7. (w 3 y 7 10)

3 10
7

• As 20 students visited on Friday and Sunday r
  17 (w 3 r 17 20)

3
17
10

• As 13 students visited on Saturday and Sunday s
  10. (w 3 s 10 13)

0

• As 30 students visited on Saturday and
• Friday as a total t 0, x 3, and z 10.

As Friday U Saturday 30, and the total Number
of students is 70,u20. (U union)
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(No Transcript)