Question

wendy gave her final exam consisting of several subjects. the average score she obtained if math is 85 .Alos the average score she obtained if math would have akso been included is 95. the score she obtained in the subject math is 100.find out the total number of subjects in which she gave her exam?
​

Answer 1

Answer:

Step-by-step explanation:

Let No of subjects=x

avg of x-1 subjects=85

so sum of marks of x-1 subjects=85(x-1)

now avg including maths=95

sum of x subjects=85(x-1)+100

=85x-85+100=85x+15

this avg=95

so (85x+15)/x=95

85x+15=95x

10x=15

x=1.5

which is not possible

so some thing wrong in qn pl check