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Verified answer
1) harga 1 buku = 21.000 ÷ 7 = 3.000jadi banyak buku = 57.000 ÷ 3. 000
= 19 buku
2) selisih umur jono dan joko = 13-10 = 3
berarti umur jono 3 tahun lebih tua dari joko
jadi umur jono = 3 + umur joko = 3 + 30 = 33