If the arithmetic mean of 7, 5, 13, x and 9 is 10, then

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According to the question,

Average =	Sum of given numbers
	Total numbers of terms

⇒ 10 =	7 + 5 + 13 + x + 9
	5

⇒ 7 + 5 + 13 + x + 9 = 10 × 5
⇒ 34 + x = 50
⇒ x = 50 – 34 = 16