Question

If the average of m numbers is a and when x is added to the m numbers, the average of m+1 numbers is b, then x is equal to?​

Answer 1

Answer:

the solution is D

Step-by-step explanation:

lets assume the sum of the m numbers = A

so A/m=y so A=my

when x is added to the m numbers the total sum of these number will be A+x and the number of these numbers will be m+1

so (my+x)/m+1 = b

my+x= bm+b

x= b(m+1)-my

the solution is D

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