Discussion

Explanation:

From the given data, we get the following diagram.

Let the total number of guests be x.

⇒ x = 144 + (25% of x) + (25% of x) + (5% of x)

⇒ x - x4 - x4 - x20 = 144

9x20 = 144

⇒ x = 320.

The total guets at the party = 320.

Hence, option (a).

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