Question

Out of four numbers, the average of the first three is 18 and that of the last three is 16. If the last number is 19, the first is

Answer 1

Answer:25

Step-by-step explanation:let assume the 4 numbers be W,X,Y,Z

(W+Y+Z)/3=18

(W+X+Y)=54...........(1)

And, (X+Y+Z)/3=16

(X+Y+Z)=48

Putting the value of Z we get ,

X+Y+19=48

X+Y=29

Now putting the value of X+Y in (1)

W+29=54

W=25