a * 18 = 270
a = 270 : 18
a = 15
 
$\snippet{name: long_division, x: 270, y: 18}$

x : 16 = 48
x = 48 * 16
x = 768
 
$\snippet{name: column_multiplication, x: 48, y: 16}$

140 : y = 70
y = 140 : 70
y = 2