IDNStudy.com, ang iyong gabay para sa maaasahan at mabilis na mga sagot. Tuklasin ang mga maaasahang impormasyon sa anumang paksa sa pamamagitan ng aming network ng bihasang mga propesyonal.
Sagot :
Present ages:
Margaret = x
Kevin = x + 4
Ages next year (+1):
Margaret = x + 1
Kevin = x + 4+1 ⇒ x + 5
Equation:
x + 5 = 2(x + 1)
x + 5 = 2x + 2
x - 2x = 2 - 5
-x = -3
-1(-x = -3) -1
x = 3
Substitute 3 to x:
Present ages:
Margaret = x ⇒ 3 years old
Kevin = x + 4 ⇒ 3 + 4 = 7 years old
ANSWER: Kevin is 7 years old.
Check their ages next year:
Margaret: 3 + 1 = 4 years old
Kevin: 7 + 1 = 8 years old
Next year, Kevin will be 2 times as old as Margaret:
8 = 2 (4)
8 = 8 True
Margaret = x
Kevin = x + 4
Ages next year (+1):
Margaret = x + 1
Kevin = x + 4+1 ⇒ x + 5
Equation:
x + 5 = 2(x + 1)
x + 5 = 2x + 2
x - 2x = 2 - 5
-x = -3
-1(-x = -3) -1
x = 3
Substitute 3 to x:
Present ages:
Margaret = x ⇒ 3 years old
Kevin = x + 4 ⇒ 3 + 4 = 7 years old
ANSWER: Kevin is 7 years old.
Check their ages next year:
Margaret: 3 + 1 = 4 years old
Kevin: 7 + 1 = 8 years old
Next year, Kevin will be 2 times as old as Margaret:
8 = 2 (4)
8 = 8 True
Let x = Margaret's age (present)
x + 4 = Kevin's age (present)
Therefore..
x + 1 = Margaret's age (next year)
x + 4 + 1 = x + 5 = Kevin's age (next year)
2(x + 1) = x + 5
2x + 2 = x + 5
2x - x = 5 - 2
x = 3 - Margaret's age (present)
x + 4 = 3 + 4 = 7 - Kevin's age (present)
Answer: 7 yrs. old
x + 4 = Kevin's age (present)
Therefore..
x + 1 = Margaret's age (next year)
x + 4 + 1 = x + 5 = Kevin's age (next year)
2(x + 1) = x + 5
2x + 2 = x + 5
2x - x = 5 - 2
x = 3 - Margaret's age (present)
x + 4 = 3 + 4 = 7 - Kevin's age (present)
Answer: 7 yrs. old
Maraming salamat sa iyong pakikilahok. Huwag kalimutang bumalik at magtanong ng mga bagong bagay. Ang iyong kaalaman ay mahalaga sa ating komunidad. May mga katanungan ka? Ang IDNStudy.com ang may sagot. Salamat sa iyong pagbisita at sa muling pagkikita.