Completing the line Problem Story on rank and array

Sample Questions A building line has some seats, in the first row there are 25 seats fruit. While on the next line there are 5 seats more fruit from the previous line. If in building row seats have 15, how the number of seats in the whole building?
Settlement Description of problem, we can conclude that the problems that we face is a problem aritmetika array, not the line and not the array geometry, this can be simpulkan of the sentence "While on the next line there are 5 seats more fruit from the previous line." So we use penyelesainnya using the formula in the formula-array geometry, the formula to find the tribe and the amount of n-n array tribe first.
The first thing we do is create a variable that is known. Namely: U1 = 25 Beda (b) = 5 The formula to find the tribe - is n Un = U1 + (n - 1) b And find the formula n is the first tribe Sn = ½ nx (U1 + Un)
So to find the number of seats that must be done is for the number of seats on the last line to the line-15 U15 = U1 + (15 - 1) 5 = 25 + (14) 5 = 25 + 70 = 95 Then, on to the line - there are 95 fruit 15 seats Number of seats in the building because the S15 seats only 15 rows So S15 = 15 ½ x (25 + 95) = ½ x 15 (120) 120 divided by 60 ½ so that the living = 15 x 60 = 900 So the number of seats in the 900 building is the seat
Categories: rank and progression,Problem Stories

Prediction SOAL UN SMP 2009 MATH

1. Results from 12 + 3 x (-2): (-3) = ...
a. 10
b. 12
c. 14
d. 16
2. At the entrance examination of Pergururan Highest Score for a correct answer is 4 and a -1 is not 0. 100 Andi's problem can be said with 60 dijawabnya correct one and the remaining 32 not answered. Score Berpakah earned Andi?
a. 208
b. 210
c. 211
d. 212
3. Two-thirds Jeksa in money to buy books belikannya Mathematics, while the rest to buy food. If used to purchase the book Mathematics is Rp. 4000, which was spent Jeksa?
a. Rp. 1,000
b. Rp. 2,000
c. Rp. 3,000
d. Rp. 4,000

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Category: Prediction, National Exam, Mathematics junior
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He Problem About Volume STORY beam

1. A bath in it is the size of 80 cm x 60 cm x 40 cm, if the tub is filled with an average speed of 4 liters / minute, then do take to the tub memenuhkan
Answer
From the above problem we have is that the form of a bath this is cake, because it is not the same size, so even if not notified of this bathtub, but the contents of soalnya we can know.
Because the rod-shaped volume of the formula we used is the beam volume formula v = pxlxt
From the problem that we can over the length = 80 cm, width = 60 cm and 40 cm high, the volume is
V = l x p x t
= 80 x 60 x 40 = 192,000 cm3
Means that the contents or bath tub is the volume of 192,000 cm3.
Because the speed of the contents so we koversikan liter unit volume that we can to the liter, where 1 liter = 1 dm3
Because the liter equal to dm cm3 then we have made to dm3

From the stairs over we can see that from cm3 to dm3 increase of 1 child in 1000 so that the divided
Volume = 192,000 cm3: 1000 = 192 dm3
Because the 1 dm3 equivalent to 1 liter, so
Dm3 volume = 192 = 192 liters.
So, full bath volume is 192 liters, if the speed contents 4 liters a minute then the time required is:
Time = 192: 4 = 48 minutes
So the time to fill the bathtub full speed with an average of 4 liters / minute is 48 minutes.

That is one way a matter of completing the story