Question

Out of four numbers the average of first3 is 15 and that of the last three is 16 ,The last number is 19, the first is?

Answer 1

14......................

Answer 2

let number be a,b, c,d=19(given)
(a+b+c)/3=15
a+b+c=45
(b+c+19)/3=16
b+c=48-19=29
b+c=29
and
we know
a+ b+ c =45
a=45-(b+c)
=45-29=16 ans
a=16
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