Question

Pak marta memiliki tanah berbentuk persegi panjang. Keliling tanah nya 224 m. Jika perbandingan panjang & lebarnya 5 : 3 brp panjang tanah?

Answer 1

K = 2(p+l)
224 = 2(5y + 3y)
224 = 2(8y)
224  = 16y
224 : 16 = y
14 = y

p = 5y = 5 x 14 = 70 m
l = 3y = 3 x 14 = 42 m

atau begini
keliling = 2 x (p + l)
224 = 2 x (p + l)
224 : 2 = p + l
112 = p + l

p = 5/(5 + 3) x 112 = 5/8 x 112 = 70 m
l = 3/(5 + 3) x 112 = 3/8 x 112 = 42 m