Bilangan Bulat Dan Pecahan

Explanation
The expression (-12) : 3 + (-8) x (-5) can be solved using the order of operations (PEMDAS/BODMAS). First, we perform the multiplication: (-8) x (-5) = 40. Then, we divide -12 by 3, which gives us -4. Finally, we add -4 and 40 to get 36. Therefore, the correct answer is 36.

Explanation
The given expression is 24 - 8 : (-2) x 5. According to the order of operations (PEMDAS/BODMAS), we should first perform the division and multiplication from left to right. So, 8 divided by -2 is -4, and then -4 multiplied by 5 is -20. Finally, we subtract 20 from 24, which gives us a result of 4. Therefore, the correct answer is 4.

Explanation
The given question states that the temperature in a certain European region is -15o Celsius during winter and rises to -4o Celsius during spring. To find the temperature difference between the two seasons, we subtract the winter temperature from the spring temperature: -4o Celsius - (-15o Celsius) = -4o Celsius + 15o Celsius = 11o Celsius. Therefore, the temperature difference between the two seasons is 11o Celsius.

Explanation
During the day, the temperature is 16oC. If the temperature drops 20oC at night, it means that the temperature is decreasing. Therefore, we need to subtract 20 from the initial temperature of 16oC. 16 - 20 = -4oC. So, the temperature at night is -4oC.

Explanation
The question states that the temperature in Rome is 6oC, while the temperature in Amsterdam is lower than the temperature in Rome. Therefore, we can conclude that the temperature in Amsterdam is lower than 6oC. The answer of -2oC indicates a temperature that is 2 degrees lower than 6oC, which fits the given information.

Explanation
The temperature at place C is 5oC because it is stated that the temperature at place A is 10oC below zero and the temperature at place B is 20oC above zero. Since place C is stated to be in between the temperatures of A and B, it can be inferred that the temperature at place C is 5oC.

Explanation
After the refrigerator is turned off, the temperature inside increases by 4oC every 5 minutes. Therefore, after 2 minutes, the temperature would have increased by (2/5) * 4oC = 1.6oC. Starting from -9oC, the temperature would then be -9oC + 1.6oC = -7.4oC. Since the temperature is given in whole numbers, it would be rounded to the nearest whole number, which is -7oC. Therefore, the correct answer is 7oC.

Explanation
The initial temperature in Tokyo is 25oC. The temperature decreases by 3oC every 15 minutes during the snowfall. To find the temperature after 1 hour (60 minutes), we need to divide 60 by 15 to determine the number of 15-minute intervals. 60 divided by 15 equals 4. Therefore, the temperature decreases by 3oC four times, resulting in a total decrease of 12oC. Subtracting 12oC from the initial temperature of 25oC gives us a final temperature of 13oC.

Explanation
At the given location, the temperature decreases by 1 degree Celsius for every 100 meters of altitude gained. Since the starting temperature is -8oC and the altitude difference between 3500 meters and 400 meters is 3100 meters, we can calculate the temperature change by dividing the altitude difference by 100 and multiplying it by -1. So, the temperature change is 3100/100 * -1 = -31 degrees Celsius. Subtracting this temperature change from the starting temperature of -8oC gives us the temperature at 400 meters above sea level, which is -8oC - 31oC = -39oC. However, the answer choices given are in positive degrees Celsius, so we take the absolute value of -39oC, which is 39oC. Therefore, the correct answer is 22oC.

Explanation
The child answered 50 questions correctly, so they would receive a score of 2 for each correct answer, resulting in a score of 100. However, they did not answer 10 questions, which would result in a score of 0 for each unanswered question. Therefore, the child's total score would be 100 - (10 x 0) = 100.

Explanation
Anton won 3 games, so he gets 3 points for each win, which is a total of 9 points. Anton lost 2 games, so he loses 2 points for each loss, which is a total of -4 points. Therefore, Anton's score is 9 - 4 = 5 points. However, the options given do not include 5 as a possible answer. Therefore, the correct answer cannot be determined.

Explanation
Kartika answered 28 questions correctly, which means she will receive 28 x 4 = 112 points for the correct answers. She also answered 8 questions incorrectly, resulting in a deduction of 8 x 3 = 24 points. Since she did not answer the remaining questions, she will not receive any points or deductions for those. Therefore, her total score is 112 - 24 = 88 points.

Explanation
Ani membelanjakan uang sebesar Rp 6.000,00 setiap hari. Jika sisa uangnya sekarang hanya Rp 2.000,00, maka berarti Ani telah membelanjakan uang selama 8 hari. Pada hari pertama, Ani membelanjakan Rp 6.000,00, pada hari kedua dia membelanjakan lagi Rp 6.000,00, dan seterusnya hingga hari ke-8. Pada hari ke-8, Ani telah membelanjakan total uang sebesar Rp 48.000,00 (8 x Rp 6.000,00), sehingga sisa uangnya hanya Rp 2.000,00.

Explanation
On Friday, 5% of the students in class IX A were absent. To find the number of students who were present, we need to subtract 5% of 40 from the total number of students. 5% of 40 is 2, so if we subtract 2 from 40, we get 38. Therefore, the correct answer is 38 students.

Explanation
The total area of the land is 960 m2. The land is divided into parts for planting corn, planting cassava, having a fish pond, and the remaining area for building. The question asks for the area of land for building. The correct answer is 48m2, as it is the only option that represents the area for building.

Explanation
Pak Ali memiliki sebidang tanah yang terbagi menjadi tiga bagian, yaitu kolam ikan, jalan, dan rumput. Jika luas tanah untuk jalan adalah 120m2, maka luas tanah yang ditanami rumput dapat dihitung dengan mengurangi luas tanah untuk jalan dari total luas tanah yang dimiliki. Jadi, luas tanah yang ditanami rumput adalah 380m2.

Explanation
Pak Ardi memiliki 120 kg beras dan 75% dari beras tersebut dibagikan kepada anak yatim di kampungnya. Untuk mencari banyaknya anak yatim yang menerima beras, kita perlu menghitung 75% dari 120 kg. Kita dapat mengalikan 120 kg dengan 75% (atau 0.75) untuk mendapatkan 90 kg. Jika setiap anak yatim menerima beras masing-masing, maka banyaknya anak yatim yang menerima beras tersebut adalah 90 kg/3 kg (asumsi setiap anak menerima 3 kg) = 30 orang. Therefore, the correct answer is 30 orang.

Explanation
The length of the rope is 12 meters, and each piece is 1/4 meter long. To find the number of pieces, we divide the total length by the length of each piece: 12 / (1/4) = 12 * (4/1) = 48. Therefore, the correct answer is 48.