6 - (3 and 4 molecules 3 + 8 molecules 1 / 12.5%) / 0.625

6 - (3 and 4 molecules 3 + 8 molecules 1 / 12.5%) / 0.625

6 - (3 and 4 molecules 3 + 8 molecules 1 / 12.5%) / 0.625
=10.6-(3.75+1)÷0.625
=10.6-7.6
=3