Question

Of the three numbers, the first number is twice the second number and the second number is twice the third number. The average of all three numbers is 21. The smallest of the three numbers is (2) 6 (1) 9​​

Answer 1

Let third number be x.

Second number = 2x.

First number = 2× 2x => 4x.

( x+2x+4x )/3= 21

=> 7x = 21×3

=> 7x = 63

=> x = 63/7

=> x = 9

Answer : 9

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Answer 2

Answer:

Let third number be x.

Second number = 2x.

First number = 2× 2x => 4x.

( x+2x+4x )/3= 21

=> 7x = 21×3

=> 7x = 63

=> x = 63/7

=> x = 9

Answer : 9

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