No. The number fifteen can be an adjective (used with a noun) or a noun if it is just a number (e.g. "You have to count to fifteen"). It can be used as a pronoun ("Twenty people were injured and fifteen of those were hospitalized").
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Depending on its usage in a sentence, the word "about" can be either an adverb, an adjective, or a preposition."There are about fifteen cats in the shelter." (adverb)"Watch yourself! There are thieves about." (adjective)"I was asking about his wife" (preposition)
15+15+15+15=60
Fifteen thousand, fifteen hundred, and fifteen dollars can be written numerically as $15,515. This is because fifteen thousand is written as 15,000, fifteen hundred is written as 1,500, and fifteen is written as 15. When you add these numbers together, you get a total of 15,000 + 1,500 + 15 = 15,515.
No, it is not an adverb. Truthful is an adjective, and the adverb form is "truthfully."
adverb is word that modified a verb,adjective.or other adverb