Question

The average of three numbers is 7 and of the first two numbers is 4 find the third number

Answer 1

Answer:

13

Step-by-step explanation:

Let the numbers be a,b,c

Then (a+b+c)/3=7

a+b+c=21-(1)

(a+b)/2=4

a+b=8-(2)

Solve the above equations to get c=13