If this is not the case, then the final result is equivalent to "adding apples and oranges."

Later she added blues, greens, grays and oranges.

When their children were born, he had a jeweller add tiny green oranges to the coronet.

But measuring progress is as hard as adding apples and oranges, elephants and ozone.

To lump them together is like adding apples and oranges.

That is, just as one cannot add heterogeneous "apples and oranges," we cannot simply add up simple units of "capital."

Trying to do so is the equivalent of adding oranges and lemons.

You can't add apples and oranges.

In mathematics you may not be allowed to add apples and oranges, but in fiction it's always good practice to juxtapose two unlikely elements.

Place the peas in a bowl and add the onion, grapefruit, oranges, jalapenos and cilantro and toss lightly.