the average of three numbers is 30.the average of two of them is 20the third number is
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Let a , b , c are three numbers ,
Average of 3 numbers = 30
( a + b + c ) /3 = 30
a + b + c = 90 -----( 1 )
Average of 2 numbers = 20
( a + b ) /2 = 20
a + b = 40 ----( 2 )
Subtract ( 2 ) from ( 1 ) we get ,
c = 90 - 40
c = 50
Therefore ,
Required third number = c = 50
I hope this helps you.
:)
Let a , b , c are three numbers ,
Average of 3 numbers = 30
( a + b + c ) /3 = 30
a + b + c = 90 -----( 1 )
Average of 2 numbers = 20
( a + b ) /2 = 20
a + b = 40 ----( 2 )
Subtract ( 2 ) from ( 1 ) we get ,
c = 90 - 40
c = 50
Therefore ,
Required third number = c = 50
I hope this helps you.
:)
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