Question

the average of 6 numbers is 30 if the average of first four is 25 and that of last three is 35 find the fourth number

Answer 1

Hello,
we indicate with a,b,c,d,e,f the six numbers
we have:
a+b+c+d = 25×4 = 100
d+e+f = 35×3 = 105
a+b+c+d+e+f = 30×6 = 180
then the fourth number is:
d=100+105-180=25

Bye :-)

Answer 2

Answer:

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✌️☘️