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semoga membantu.
e = umur Elisa
f = umur Firda
d = e + 4 thn
e = f + 3 thn
d + e + f = 58 thn
Dit: d + f =...?
Jwb: d = e + 4 thn
= f + 3 thn + 4 thn
= f + 7 thn
d + e + f = f + 7 + f + 3 + f
58 thn = 3f + 10 thn
3f = 48 thn
f = 16 thn
d + f = 16 thn + 7 thn + 16 thn
= 39 thn