Question

the average of three nos is 30.the first is twice of 2nd and 2nd is one third of third no.find the nos

Answer 1

average of three numbers=30
Then, sum of the three numbers=30*3=90
Let second number be x
first number will be 2x
third number will be 3x
Then, 2x+x+3x=90
6x=90. x=15
first number =2*15=30
second number=15
Third number=3*15=45

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Answer 2

Solution:

Let x,y,z be the three number.

x=2y=z/3

if x=30 and y =15 and z=45, where 30 is twice of 15 and 45 is 1/3 of 15..

30+15+45=90/3=30

Therefore, first number=30 and second number =15 and third number=45.