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jumlah umur mereka 23 th..
.
23 / 2 = 11,5
5 / 2 = 2,5
maka umur dina = 11,5 - 2,5 = 9
Dina : 5 tambah x
Jumlah : 23
5 tambah x tambah x : 23
2x : 23 dikurang 5
2x : 18
x : 18 dibagi 2
x : 9
DIna : 5 tambah 9 : 14