Average Practice Test 5

Question : 16 of 40

Marks: +1, -0

Of the four numbers, whose average is 60, the first is one-fourth of the sum of the last three. The first number is:

Solution:

Let the four numbers be a, b, c and d.
Now,

1/4( b+c+d)=a

⇒b+c+d=4a

Again,

{a+b+c+d}/40=60

⇒a+4a=240

⇒a=48

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