Question

A number is first increased by 30 and then decreased by 20 . Find the net change in the number

Answer 1

Answer:

+10 is the answer

Step-by-step explanation:

30-20=10

Answer 2

Therefore the number is increased by 10.

Step-by-step explanation:

Let the number be x.

First the number is increased by 30.

Then the number becomes = x+30

Then the number is decreased by 20.

The new number is = (x+30-20)

                                =(x+10)    [ like terms are added]

The difference between new number and original number is

=(x+10-x)

=10

Therefore the number is increased by 10.