Kinoteatrga kelgan tomoshabinlar 20 so'mdan yig'ishsa 20 so'm yetmaydi, 30 so'mdan yig'ishsa 20 so'm ortib qoladi. Kinoteatrga nechta tomoshabin kelgan va necha so'm yig'ilgan.

  1. 4; 80
  2. 4; 100
  3. 5; 100
  4. 6; 50

📝 Detailed explanation

Tomoshabinlar sonini x, kerakli umumiy summani S deb olamiz.
Shart bo'yicha ikkita tenglama tuzamiz: 20x + 20 = S va 30x - 20 = S.
Ularni tenglashtiramiz: 20x + 20 = 30x - 20 => 10x = 40 => x = 4 (tomoshabinlar soni).
Kerakli summani hisoblaymiz: S = 20 · 4 + 20 = 100 so'm.
8 / 10 (80%)
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