nih nomor 2,3,4, aja y

4. k persegi panjang = 2(p+l)
124 = 2 (3p+5 + p-3)
62 = 4p + 2
60 = 4p
15 = p
lebar = p-3 maka lebar = 15-3 = 12 cm
inshaallah :)