Cara ngerjainnya no 22 gimana ya? Jangan pakai jawaban ya, rumusnya aja :)
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32/40 = (32 + 4 + 4)/ X
= 32/40 = 40/ X
X = 40 × 40/32
X = 50
Jadi, Lebar bingkai bagian bawah
= (50 - 40)/2
= 5 cm
Maaf jika slh!