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Verified answer
Bab PerbandinganMatematika SMP Kelas VII
Andi = x
Budi = y
Jika bekerja sama = 4
(x . y)/(x + y) = 4
(5 . y)/(5 + y) = 4
5y = 4 (5 + y)
5y = 20 + 4y
5y - 4y = 20
y = 20
jadi, waktu kerja Budi jika ia bekerja sendirian adalah 20 hari