1

There are two variables A and B. A decreases from 100 to 5 while B decreases from 100 to 80.

I want to say that the degree of drop for B is less than A. What should I say that more formally?

My answer is "B decreased not so much as A." But I suppose that it is not native English.

2

not so much as == less than

B decreased less than A did.

B's level of decrease was less than A's.

  • 2
    For formal English, I think the first line needs "did" at the end: B decreased less than A did. I think the second line is more precise and the better option. – Ringo Jan 4 '18 at 9:59

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