2/5
BREAKDOWN:
You can simply divide 16 by 40:
Fraction = (16 kg) / (40 kg)
Now, simplify this fraction by dividing both the numerator and denominator by their greatest common divisor, which is 8:
Fraction = (16 kg / 8) / (40 kg / 8)
Fraction = 2/5
So, 16 kg is 2/5 of 40 kg.