Question

The average of 3 numbers is 26 the average of 2 numbers is 32 what is the third number

Answer 1

Let,

• The three numbers be a,b,c.

(a+b+c)/3 = 26

Sum of three numbers is 26*3 = 78

(a+b)/2 = 32

Sum of a+b = 32*2= 64

a+b+c=78

64+c=78

c=78-64

c=14

Therefore, third number is 14.

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Another way

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Average of 3 numbers = 26

The total of same 3no. = 26*3=78

Average of 2 numbers = 32

Total of the 2 numbers 32*2=

Therefore,

Third no. = 78-64 = 14.

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Note- * represents multiplication.