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2 : (1+3) = 3 : BC
2 : 4 = 3 : BC
1 : 2 = 3 : BC
BC = 3 x 2
BC = 6
13. pakai perbandingan juga
4 : 5 = AB : 10
AB = 4/5 x 10
AB = 8
15. Rumusnya :
EF = [(AB x ED) + (DC x AE)] : (ED + AE)
= [(11 x 2) + (6 x 3)] : (2 + 3)
= 22 + 18 : 5
= 8
jawabnnya A
Nomer 13
jawabnnya B
nomer 15
jawabnnya B