There's a catch here, and I don't really want to go into full detail. Because of this catch, I think it would be unusually tough to write a simple equation for this situation. If you wouldn't mind, let's just list it instead:
After . . water added . . total in pool
7 min . . . 14 gallons . . . 14 gallons 1 more . . 1 gallon . . . . . 15 gallons 7 more . . 14 gallons . . . 29 gallons 1 more . . 1 gallon . . . . . 30 gallons 5 more . . 10 gallons . . . 40 gallons, the pool is full
Add up all the minutes: 21 minutes
It would take 21 minutes As the first 8 minutes there would be 15 gallons in the pool In 16 minutes there would be 30 gallons in the pool Therefore you only need 10 gallons left which will be filled up in the space of 5 minutes
It will take approximately 21.33 minutes to fill a 40-gallon pool with 2 gallons of water being added every minute while 1 gallon is being scooped out every 8 minutes. This results in a net inflow of 1.875 gallons per minute. Therefore, the calculation gives us the total time needed to fill the pool.
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Jawaban:1. Ringkasan masalah:Pak Amir memiliki bengkel dengan total 46 kendaraan (mobil dan motor). Total roda dari semua kendaraan adalah 124. Tentukan jumlah mobil dan motor.2. Penyelesaian:Misalkan:x = jumlah mobily = jumlah motor Kita memiliki dua persamaan:Jumlah kendaraan: x + y = 46Jumlah roda: 4x + 2y = 124 (karena mobil memiliki 4 roda dan motor memiliki 2 roda) Langkah 1: Sederhanakan persamaan kedua dengan membagi semua suku dengan 2:2x + y = 62 Langkah 2: Gunakan metode eliminasi. Kurangkan persamaan pertama dari persamaan yang telah disederhanakan:(2x + y) - (x + y) = 62 - 462x + y - x - y = 16x = 16 Langkah 3: Substitusi nilai x ke persamaan pertama untuk mencari y:16 + y = 46y = 46 - 16y = 30 Jadi, jumlah mobil adalah 16 dan jumlah motor adalah 30.