If d is a decimal, is d ≥ 1.55?

(1) When d is rounded to the nearest tenth, the result is 1.6

(2) When d is rounded to the nearest integer, the result is 2

I am struggling to solve this question on the basis of "if d is a decimal". Can someone explain what does this mean please and then the solution as well?

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E.

MGMAT 1 --> 530

MGMAT 2--> 640

MGMAT 3 ---> 610

GMAT ==> 730