berapakah ubin putih jika ubin biru nya 400

Banyak ubin warna biru = 400 ubin
x² = 400
x = √400x
x = 20
Jadi, banyak ubin putih
= 8+(x-1).4
= 8+(20-1).4
= 8+19.4
= 8+76
= 84 ubin