tolong jawab nanti dikumpulkan 4 sampai 8

4) bagian yg dituangkan = 2/3 - 2/5
= 10/15 - 6/15
= 4/15 bagian

4/15x = 12
x = 15/4 × 12 = 45

5) Misal : usiaku = a
usia ayahku = b

a=1/3 . b
b = 3a

(a-5) = 1/4.(b-5)
4(a-5) = b-5
4a-20 = 3a-5
a= 15

yg lain pikir sendiri yaa