Final answer:
Mr Billingsworth-Smyth will use 20ml of medication per day, so a 100ml bottle will last him 5 days.
Step-by-step explanation:
Mr Billingsworth-Smyth has been prescribed a liquid medication. He is to take 10ml of the medication twice a day. Given the bottle holds 100ml, we calculate the number of days' worth of medication as follows: First, we find out the total amount of medication Mr Billingsworth-Smyth will use per day, which is 20ml (10ml taken twice a day). Next, we divide the total volume of medication in the bottle (100ml) by the daily usage (20ml). So, 100ml ÷ 20ml/day equals 5 days. Therefore, Mr Billingsworth-Smyth has enough medication for 5 days.