The average of five numbers is 50. If the average of first three is 40 and that of last three is 60, the third number is :
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15
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Step-by-step explanation:
Let the five numbers be
a,b,c,d and e
Average = 50
a+b+c+d+e/5 = 50
a+b+c+d+e = 250.... (1)
First three numbers
a+b+c/3 = 40
a+b+c = 120.... (2)
Last three numbers
c+d+e/3 = 60
c+d+e = 180.... (3)
Adding (2) and (3)
(a+b+c+d+e) + c = 300
From equation (1)
250+c = 300
Therefore c = 50
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