Question

The average of four numbers is 30 . If the sum of first three numbers is 85, the
fourth number is:

Answer 1

Answer:

25

Step-by-step explanation:

Sum of 6 numbers =60×30=180

Sum of 6 numbers =60×30=180Sum of first 4 numbers =4×25=100

Sum of 6 numbers =60×30=180Sum of first 4 numbers =4×25=100Sum of last 3 numbers =3×35=105

Sum 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

Sum 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

Sum 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

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Answer 2

Step-by-step explanation:

total/total number=avarge

total number = avarge×total number

=30×4=120

total number=120

4 th number = total -total of first 3 number

= 120-85=35