Bacaan
Protect the Lane, and They Will Ride? (fictional report)
KOTA LARASATI (fictional) — In October 2025, the city council of Kota Larasati replaced the painted bicycle lane on Jalan Melati with a lane separated from traffic by a low concrete kerb. To see what changed, council staff counted the traffic passing one point on the street between 06.00 and 09.00 on five weekday mornings in September 2025, before the work began, and again on five weekday mornings in March 2026. The table shows the average count per morning.
| Road user | September 2025 | March 2026 |
|---|---|---|
| Bicycles | 180 | 420 |
| Motorcycles | 2,400 | 2,150 |
| Cars | 900 | 880 |
In March, the staff also interviewed 150 cyclists on Jalan Melati who said they had not cycled on the street before the new lane opened. Of these, 84 said they used to make the same trip by motorcycle, 39 by shared minibus (angkot), and 27 by car.
"The numbers speak for themselves," said council member Dewi Anggraini (fictional). "Protect the lane, and people will ride. We should build the same kind of lane on every major street in the city."
Soal 1
Tentukan tiap pernyataanBased on the text and the table, decide whether each statement is True or False.
| Pernyataan | True | False |
|---|---|---|
| 1. The average number of bicycles counted each morning more than doubled. | ||
| 2. The number of cars fell by more than the number of motorcycles did. | ||
| 3. More than half of the new cyclists who were interviewed used to make the trip by motorcycle. | ||
| 4. Counting bicycles, motorcycles, and cars together, the average total per morning was lower in March 2026 than in September 2025. |
Lihat kunci & pembahasan
Kenapa benar
Tiga pernyataan benar (True): sepeda naik dari 180 menjadi 420 (lebih dari dua kali lipat), 84 dari 150 pesepeda baru (56%) dulu bermotor, dan total ketiga jenis turun dari 3.480 menjadi 3.450. Satu pernyataan salah (False): mobil hanya turun 20, sedangkan sepeda motor turun 250.
Langkah
s1: dua kali 180 = 360, sedangkan hitungan Maret 420 > 360 → True.
s2: penurunan mobil 900 − 880 = 20; penurunan sepeda motor 2.400 − 2.150 = 250. 20 < 250 → False.
s3: setengah dari 150 = 75, dan 84 > 75 (84/150 = 56%) → True.
s4: September 180 + 2.400 + 900 = 3.480; Maret 420 + 2.150 + 880 = 3.450. 3.450 < 3.480 → True.
Tips: untuk tabel, tulis selisih atau total di kertas buram dulu, baru bandingkan dengan pernyataan. Jangan menilai dari kesan sekilas.
Kenapa opsi lain salah
- s1.
True. 420 lebih besar daripada 2 × 180 = 360, jadi jumlah sepeda lebih dari dua kali lipat.
- s2.
False. Mobil hanya turun 20 (900 → 880), sedangkan sepeda motor turun 250 (2.400 → 2.150). Kesalahan umum adalah membandingkan angka akhirnya, bukan selisihnya.
- s3.
True. 84 dari 150 orang sama dengan 56%, lebih dari separuh.
- s4.
True. Total turun tipis dari 3.480 menjadi 3.450. Kenaikan sepeda (+240) lebih kecil daripada gabungan penurunan sepeda motor dan mobil (−270).
Konsep
Membaca teks bertabel: menghitung selisih, total, dan proporsi dari data, lalu mencocokkannya dengan pernyataan.
Jebakan umum
Membandingkan nilai akhir (880 dan 2.150) padahal yang ditanya adalah besar penurunannya.
Mengira total pasti naik karena jumlah sepeda naik tajam.
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