Question

There are some balls of red, green and yellow colour lying on a table. Three are as many red balls as there are yellow balls. There are twice as many yellow balls as there are green ones. The number of red balls is:
1. is equal to the sum of yellow and green balls
2. is double the number of green balls
3. is equal to yellow balls minus green balls
4. cannot be ascertained

Answer 1

Correct Answer - Option 2 : is double the number of green balls

Given:

Number of Red balls = Number of Yellow balls.

Number of Yellow balls = 2 × Number of Green balls.

Calculation:

Let the number of Red balls, Yellow balls and Green balls be R, Y and G. 

According to the question,

R = Y      ----(i)

& Y = 2G      ----(ii)

From the above equations, we conclude that,

R = Y

⇒ R = 2G

∴ The number of red balls is double the number of green balls.