tolong dijawab no. 6 - 12! please pake cara!

6)
100 → 55
n ←55+10 = 65
maka,
n/100 = 55/65
65xn = 55x100
65xn = 5.500
n = 5.500 : 65
n = 84,6 dibulatkan menjadi 85 hari

7)
22 → 20
22-10 = 12 → 20
12-6 = 6 ← n
maka,
12/6 = n/20
6xn = 12x20
6xn = 240
n = 240:6
n = 40
jadi,
banyak pekerja yg harus ditambah
= 40-20
= 20 orang

8)
K.pp = 80
2x(p+l) = 80
p+l = 80:2
p+l = 40
7n+3n = 40
10n = 40
n = 40:10
n = 4
maka,
p = 7n = 7x4 = 28 cm
l = 3n = 3x4 = 12 cm
jadi,
L.pp
= p x l
= 28 x 12
= 336 cm²

9)
jumlah perbandingan = 7+3 = 10
maka,
uang Dani
= 7/10 x 500.000
= 350.000 rupiah

uang Dini
= 3/10 x 500.000
= 150.000 rupiah

jadi,
selisih uang keduanya
= 350.000 - 150.000
= 200.000 rupiah

10)
24 → 20
24-6 = 18 → 20
18-3 = 15 → n
maka,
18/15 = n/20
15xn = 18x20
15xn = 360
n = 360 : 15
n = 24 orang