You pour a guest a 250 ml glass of 13% wine, then top her up with another 142 ml of the same wine. How many standard drinks has she had?
Option A: About 2
Option B: About 2.5
Option C: About 3
Correct answerOption D: About 3.5
Explanation
The 250 ml glass is about 1.9 standard drinks and the 142 ml top up adds about 1.1, for about 3 in total. Top ups are easy to miss because the glass never leaves the table. Count the wine you pour, not the glasses you set down.