average of four number is 24 out of four numbers one is 18, another is 19 and third one is 21 find the fourth number
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Answer:
38
Step-by-step explanation:
average = total sum ÷ number of terms
Let the 4th number be x
=> 24 = (18 + 19 + 21 + x) ÷ 4
=> 24 × 4 = 18 + 19 + 21 + x
=> 96 = 58 + x
=> x = 96 - 58 = 38
Therefore x = 38
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