Today our teacher tried at great length to explain that you can't add, say, 1.5 feet plus 3 meters and get 4.5 something—you have to convert one unit to the other, obvs. So she took that old saying about apples and oranges and rendered it obsolete.
"Say I have three oranges, and then two apples. What do I have? See, you can't do it!"
"You have 5 pieces of fruit."
Oh yeah. But I guess the point is that you have to convert apples to oranges first. Anyone know what that formula is?
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