Question

The average of 5 consecutive number is n. If the next two number are also included. The average of 7 numbers will be increased by :

Answer 1

x+x1+x+2+x+3+x+4 ÷ 5 = n

5x + 10÷5 =n

5(x + 2)÷5=n

x+2=n

x+x+1+x+2+x+3+x+4+x+5+x+6 ÷ 7 =

7x + 21÷7 = n

7(x + 3)÷7= n

x+3= n

average will increase by 1