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S = Sinta
J = Jojo
K = Kim
M = Simon
Kalimat matematika dari soal tsb adalah
M = N - 2 ==> N = M + 2
M = J + 4 ==> J = M - 4
S = 2M
S = K + 5
N + S + J + K + M = 63
S = 2M = K + 5 ==> K = 2M - 5
N + S + J + K + M = 63
(M+2)+(2M)+(M-4)+(2M-5)+M = 63
M+2M+M+2M+M+2-4-5 = 63
7M - 7 = 63
7M = 63 + 7
7M = 70
M = 10
N = M + 2 = 10+2 = 12
S = 2M = 2(10) = 20
J = M - 4 = 10 - 4 = 6
K = 2M - 5 = 2(10)-5 = 20-5 = 15
M = 10
Anak pertama : Sinta, umur = 20 tahun
Anak kedua : Kim, umur = 15 tahun
Jumlah umur anak pertama dan kedua adalah
20+15 = 35 tahun