Ответы на вопрос:
ответ:Let A = Ahmad's age B = Bobby's age J = John's age
1) A = 2*B or B = A/2
2) J = A - 7
3) A + B + J = 38
You have 3 equations and 3 unknowns. Start by substituting equation 1) and equation 2) into equation 3) and solve for A:
A + A/2 + (A-7) = 38 (combine like terms)
2.5*A = 38 + 7 = 45
A = 45/2.5 = 18 yrs old (Ahmad's age)
B = A/2 = 18/2 = 9 yrs old (Bobby's age)
J = A - 7 = 18 - 7 = 11 yrs old (John's age)
Пошаговое объяснение:
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