Question

In 2015 the population of city X and Y were equal. From 2010 to 2015 the population of city X increased by 20% and the population city Y is decreased by 10%. If the population of city X was 120000 in 2010. What was the population of city Y in 2010?​

Answer 1

Step-by-step explanation:

1: population of city x in 2010=120000

it increases by 20 % in 5 years . so in 2015 it w ik ll be 20/100×120000= 24000 = 120000+24000=

144000. Thus population of city x in 2015 is 144000.

2: the population of city x and y are same in year 2015.

3: to find= population of city y in 2010 .if it reduces by 10% in 5years.it will be 10 % more in year 2010

4: let population of city y in year 2015 be 100.

it gets increased by 10 % = 110

thus-. 100/110 = 144000/x

x= 144000×110÷100

x=158400

population of city x is 158400