Average Practice Test 2

Question : 39 of 40

Marks: +1, -0

Of the three numbers, first is twice the second and second is twice the third. The average of the reciprocal of the numbers is

7 /72

. The numbers are:

Solution:

Let the three numbers be

x,x/2,x/4

then,

1/3(1/x+2/x+4/x)=7/72

⇒7/x=7/24

∴x=24

Hence, three numbers will be 24, 12, 6.

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