Cara nya ka.. Makasi

9. L + E = 77
L = 77 - E
L / E = 5 / 6
(77 - E) / E = 5 / 6
(77 - E) x 6 = 5E
462 - 6E = 5E
462 = 6E + 5E
462 = 11E
E = 462 / 11 = 42
L = 77 - 42 = 35
jadi Kelas V = 35 orang, kelas VI = 42 orang

10. P + L = 10
P = 10 - L
P / L = 3 / 2
(10 - L) / L = 3 / 2
(10 - L) x 2 = 3L
20 - 2L = 3L
20 = 3L + 2L
20 = 5L
L = 20 / 5 = 4
P = 10 - 4 = 6
Jadi panjang = 6 meter dan lebar = 4 meter

11. T - R = 3000
T = 3000 + R
T / R = 7 / 4
(3000 + R) / R = 7 / 4
(3000 + R) x 4 = 7R
12000 + 4R = 7R
12000 = 7R - 4R
12000 = 3R
R = 12000 / 3 = 4000
T = 3000 + 4000 = 7000
Jadi Tini = 7000 dan Rina = 4000