In Paris, the sculpture Long-Term, created by Armand Fernandez, contains 60 cars embedded in 3.5 million pounds of concrete. How many tons of concrete is this?

You'll obviously have to convert "million pounds" to "tons."

Hint: 1 ton = 2000 pounds. Create a conversion factor from this and then multiply "3.5 million pounds" by your conversion factor (with "pounds" in the denominator of this factor).