Son reglas de tres simples a)15 pies a m
1 pies = 0, 3048mts15 pies = x x = 15pies * 0, 3038mts / 1pies = 4, 572mts
b)35 m a pies
1 mts = 3, 2808 pies35 mts = x x = 35mts * 3, 2808pies / 1mts = 114, 829pies
c)12 kg a libras
1 kg = 2, 2046libras12kgs = x x = 12kgs * 2, 2046libras / 1kg = 26, 45 libras
d)30 pulg a cm
1 pulgada = 2, 54cm30pulg = xx = 30pulg * 2, 54cm / 1pulg = 76, 2cm
e)15 m a yardas
1 m = 1, 09 yd15 m = x x = 15m * 1, 09yd / 1m = 16, 404yd
f)100 millas a km
1 milla = 1, 6093 km100 millas = x x = 100millas * 1, 6093km / 1milla = 160, 934km
g)0.
5 lt a cm ^ 31 lits = 1000cm ^ 30.
5lits = xx = 0.
5lts * 1000cm ^ 3 / 1lits = 500cm ^ 3.