minta pakai caranya

1. Total 50 soal
Benar = 37 (4) = 148
Salah = 9 (-2) = -18
Tidak dijawab = 4 (-1) = -4

Maka skor yg didapat
148 - 18 - 4 = 126

2. p : l = 7x : 3x
Keliling p.panjang = 2(p+l)
80 = 2(7x + 3x)
80 = 2(10x)
80 = 20x
x = 80/20 = 4

Maka luas persegi panjang
L = p x l
L = 7(4) x 3(4)
L = 28 x 12
L = 336cm2