find the average of 12 numbers if first 9 numbers avg = 57 and the last 3 numbers avg = 21 .....................................................................................................................................................................
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Answer:
48
Step-by-step explanation:
= > Average of first 9 = 57
= > (sum of first 9 no.)/9 = 57
= > sum of first 9 no. = 57 * 9 = 513
Whereas,
= > Average of last 3 = 21
= > (sum of last 3 no.)/3 = 21
= > sum of last 3 no. = 21 * 3 = 63
Hence,
Average of all 12 :
= > (sum of first 9 + sum of last 3)/12
= > (513 + 63)/12
= > (576)/12
= > 48
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