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p=pensil
3b+2p=13000|×2| 6b+4p=26000
2b+5p=16000|×3| 6b+15p=48000
______________-
-11p=-22000
p=-22000:-11
=2000
3b+2p=13000
3b+2×2000=13000
3b+4000=13000
3b=13000-4000
3b= 9000
b=9000/3
= 3000
4 buku= 4×3000
=12000
3 pensil=3×2000
=6000
jumlah=12000+6000
=18000
itu nomor 22. maaf kalau ada yang salah.