Вопрос школьника по предмету Математика
Сумма трёх чисел равна 60. Найдите эти числа, если первое число больше второго на 4 единицы, а третье число больше второго на 11 единиц. Помогите пожалуйста!!!
Ответ учителя по предмету Математика
x — первое число, значит (x — 4) — второе число, тогда (x — 4 + 11) — третье число
x + (x — 4) + (x + 7) = 60 — по условию
x + x — 4 + x + 7 = 60
3x + 3 = 60
3x = 57
x = 19 — первое число
x — 4 = 19 — 4 = 15 — второе число
x + 7 = 19 + 7 = 26 — третье число
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