Question

c) Two years ago, when the number of students of a school was increased by 25%, it became 500. Last year, again the number was increased by 20%. How many new students were enrolled in two years​

Answer 1

Hello,

200

Step-by-step explanation:

Two years ago, the number of students was x.

x*(1+25/100)=500

x*5/4=500

x=500*4/5

x=400

Last year,the number of students was 500 and increase of 20%.

500*(1+20/100)=500*6/5=600

600-400=200 students were enrolled in two years.

Answer 2

200 new students

Step-by-step explanation:

Let the number of student before two years be s

If the number of students is increased by 25%

s × (125%) = 500

1.25s = 500

s = 500/1.25

s = 400

• This means the number of student before two years was 400.

If the number of students two years ago increased by 20%

500 × (120%) = 600 students

• This means the number of present/current students is 600.

Number of new students enrolled:

= present number of students - number of students before two years

= 600 - 400

= 200