If the average of 3 number is 17 that of first two are 16 that the third number is
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19 is correct
how i got is
let the three numbers be a, b, c
average = a+b+c / 3 = 17 (given)
=> a+b+c = 51..................(1)
now the average of first two numbers is 16
=> a+b / 2 = 16
=> a+ b = 32....................(2)
put (2) in (1)
=> 32 + c = 51
=> c = 51 - 32
=> c= 19
therefore the third number is 19.
how i got is
let the three numbers be a, b, c
average = a+b+c / 3 = 17 (given)
=> a+b+c = 51..................(1)
now the average of first two numbers is 16
=> a+b / 2 = 16
=> a+ b = 32....................(2)
put (2) in (1)
=> 32 + c = 51
=> c = 51 - 32
=> c= 19
therefore the third number is 19.
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