Предмет: Математика, автор: leylasevaesma

Вюсаля за 5 тетрадей и 3 ручки заплатила 3 маната 40 гяпик. Тетрадь на 20 гяпик дороже ручки. Сколько стоит тетрадь? а) 30 гяп b) 50 гяп c) 20 гяп

Ответы

Автор ответа: hypefaq

0

Ответ: b) 50 гяп

Решение:

3 ман. 40 гяп. = 340 гяп.

Пусть стоимость ручки - x, тогда стоимость тетради будет x + 20

3 * x + 5(x + 20) = 340

3x + 5x + 100 = 340

8x + 100 = 340

8x = 340 - 100

8x = 240

x = 30

30 + 20 = 50 (гяп) - стоимость тетради

Ответ: тетрадь стоит 50 гяп.

leylasevaesma: спасибо вы мне очень помогли

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