Selina is 4 years younger than khairul now. Three years ago, Selina's age was 3/5 the age of Khairul then. Let the present age be w years old (a) Form an equati
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Pertanyaan
Selina is 4 years younger than khairul now. Three years ago, Selina's age was 3/5 the age of Khairul then. Let the present age be w years old (a) Form an equation in terms of w and solve it. (b) Hence, find Khairuls present age
1 Jawaban
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1. Jawaban incarnadine
the equation
S = K - 4
three years ago
S - 3 = 3/5 (k - 3) ---> mutiply with 5
5s - 15 = 3 ( k - 3)
5s - 15 = 3k - 9
5s - 3 k = -9 + 15
5(k - 4) - 3k = 6
5k - 20 - 3k = 6
2k = 26
k = 13 yo
s = 9 yo