Kuis Matematika Smk Kelas X

Explanation
The correct answer is 40. This is because when subtracting a negative number, it is equivalent to adding the positive counterpart. Therefore, 20 - (-12) can be rewritten as 20 + 12, which equals 32. Adding 8 to 32 gives us a final result of 40.

Explanation
The correct answer is 130 because when we add 120 and -20, we get 100. Then, when we subtract -30 from 100, it becomes 130.

Explanation
Bentuk pecahan biasa dari 25% adalah 1/4. This is because 25% can be expressed as a fraction by dividing 25 by 100, which gives us 25/100. This fraction can be simplified by dividing both the numerator and the denominator by their greatest common divisor, which is 25. Simplifying the fraction gives us 1/4.

Explanation
The correct answer is 0,35%.

Explanation
Amir mengendarai motor sejauh 30 km dengan kecepatan 80 km/jam dalam waktu 40 menit. Jika kecepatan motor dikurangi menjadi 50 km/jam, maka waktu yang dibutuhkan akan lebih lama karena kecepatannya lebih rendah. Oleh karena itu, waktu yang dibutuhkan jika Amir mengendarai motor dengan kecepatan 50 km/jam akan lebih dari 40 menit. Pilihan yang paling mendekati adalah 45 menit, 50 menit, 55 menit, dan 62 menit. Namun, pilihan yang paling tepat adalah 64 menit, karena dengan kecepatan yang lebih rendah, waktu yang dibutuhkan akan semakin bertambah.

Explanation
Adi's average speed is 60 km/h. In 45 minutes, he travels a distance of 50 km. To find the distance he travels in 30 minutes, we can use the formula distance = speed × time. Converting 30 minutes to hours, we get 0.5 hours. So, the distance Adi travels in 30 minutes is 60 km/h × 0.5 hours = 30 km. Therefore, the correct answer is 37.5 km.

Explanation
The scale of 1 : 30,000 means that 1 cm on the map represents 30,000 cm in real life. Given that the distance between Slawi and Tegal on the map is 20 cm, we can calculate the actual distance by multiplying 20 cm by the scale factor of 30,000. This gives us a result of 600,000 cm or 6 km. Therefore, the correct answer is 6 km.