Test Index

SSC CGL Model Paper 17

Question : 2 of 99

Marks: +1, -0

Solution:

Concept:

Frame equations from the given ratio and the changed number of boys and girls.

Explanation:

Let the number of girls be

G

and boys be

B

Initially,

G = \frac{B}{3}

, so

B = 3G

After 2 hours, boys become

B - 8

and girls become

G + 2

They are equal, so

B - 8 = G + 2

Substitute

B = 3G

3G - 8 = G + 2

2G = 10

G = 5

Then

B = 3G = 15

Total initially

= B + G = 15 + 5 = 20

Answer:

20 people were present at the party two hours before.

Go to Question:

Prev Question

Next Question