Question

The population of a city increased by 15 °/• in a year . If the present popualation is 20 , 700 find the population a year ago .​

Answer 1

Answer:

Step-by-step explanation:

Let us take the population one year ago be x.

Then the population after one year = 115x/100.

But it is given 20700.

So Atq. ,115x/100= 20700

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or x.= 20700×100/115

Therefore x =18000.

Therefore the population one year was 18000.

Answer 2

Answer

17, 595

Step-by-step explanation:

(For solving this answer you should know how to use increase and decrease in percentage.)

Present population =20,700

Percentage of increase in population=15%

(so that means last years population was increased by 15%of 20,700)

increase in population = 20,700*15/100(15%=15/100)

= 3, 105

Let last years population be x then

x + 3,105=20,700

x =20,700-3,105

x = 17,595

hence we got this answer, if any doubt follow me and chat with me,

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