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ab/28=15/21
ab=28.15:21
ab=20
21x = 420
x = 20 (C)
2. 21/0.42 = x/0.15
0.42x = 3.15
x = 7.5 (D)
3. 9/6 = 10+x/10
90 = 60+6x
30 = 6x
x = 5 (C)
4. itu yang A yang salah. karena panjang KL seharusnya sama dengan panjang DF bukannya EF