ANS:B - 22.5 cm c/c

The notation "c/c" stands for "center to center," indicating the distance between the centers of adjacent openings. Given that the bottom openings in the standing baffle wall are 15 cm x 15 cm, we need to determine the distance between the centers of these openings. The correct option would be the one that provides the distance between centers of adjacent openings as per the provided dimensions. For a 15 cm x 15 cm opening, the distance between the centers of adjacent openings should be calculated as follows:

• For a square opening, the distance between the centers would be equal to the diagonal of the square.
• The diagonal of a square can be calculated using the Pythagorean theorem, where the diagonal (D) is equal to the square root of the sum of the squares of the sides.

So, for a 15 cm x 15 cm square opening: D=(15)2+(15)2​ D=225+225​ D≈21.21 cm Given the options provided:

• 15 cm c/c: This doesn't align with the calculated distance between centers.
• 22.5 cm c/c: This doesn't align with the calculated distance between centers.
• 30 cm c/c: This doesn't align with the calculated distance between centers.
• 50 cm c/c: This also doesn't align with the calculated distance between centers.

None of the provided options matches the calculated distance between centers for the given square openings of 15 cm x 15 cm. Therefore, none of the options provided is correct based on the given dimensions.