The average of 6 numbers is 30. If the average of the first four is 25 and that of the last three is 35, the fourth number is

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Solution

The correct option is A 25
Sum of 6 numbers $= 60 \times 30 = 180$
Sum of first 4 numbers $= 4 \times 25 = 100$
Sum of last 3 numbers $= 3 \times 35 = 105$
$∴$ Fourth number $= (100 + 105) - 180$
$= 205 - 180$
$= 25$

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The average of 6 numbers is 30. If the average of the first four is 25 and that of the last three is 35, the fourth number is

The correct option is A 25Sum of 6 numbers =60×30=180Sum of first 4 numbers =4×25=100Sum of last 3 numbers =3×35=105∴ Fourth number =(100+105)−180 =205−180 =25

The correct option is A 25
Sum of 6 numbers $= 60 \times 30 = 180$
Sum of first 4 numbers $= 4 \times 25 = 100$
Sum of last 3 numbers $= 3 \times 35 = 105$
$∴$ Fourth number $= (100 + 105) - 180$
$= 205 - 180$
$= 25$