Andrew wants to place grouping symbols in the expression

15 + 25 - 18 : 2 so that it has a value of 18.5.

Which shows the correct placing of the grouping symbols?

A.

(15 + 25) - 18 : 2

B.

15 + (25 - 18 : 2)

C.

15 + (25 - 18) : 2

D.

15 + 25 - (18 : 2)

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