The average of 3 numbers is 78. A fourth number was added the new average was 63.What is the value of the fourth number?
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Step-by-step explanation:
Sum of 6 numbers =60×30=180
Sum of first 4 numbers =4×25=100
Sum of last 3 numbers =3×35=105
∴ Fourth number =(100+105)−180
=205−180
=25
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