Question

Initially, there were the same number of blue marbles and red marbles a bag John took out 5 blue marbles and then there were twice as many red marbles as blue marbles in the bag. How many red marbles are there in the bag?​

Answer 1

Answer:

10

Step-by-step explanation:

let no. of blue and red marbles be x

then after taking 5 blue marbles from the bag..no. of blue marbles left in the bag wil be x-5.

according to the question

x=2(x-5)

x=10

Answer 2

Answer:

The number of red marbles in the bag is 10.

Step-by-step explanation:

Given : In a bag, there were same number of marbles blue and red.

          the red marbles were twice blue marbles when5 blue marbles taken out.

To find : the number of red marbles in the bag.

Solution :

Let x be the number of red marbles and y be the number of blue marbles.

Since, the number of red and blue marbles were same

⇒ x = y -------eq.(1)

Also, John took  5 blue marbles ⇒ y-5,

then the number of red marbles became twice the blue marbles.

That is, x = 2(y-5)

     ⇒ x = 2y-10

     ⇒ x= 2(x)-10

     ⇒2x - x = 10

     ⇒x= 10 and y= 10.

Therefore, the number of red marbles in the bag is 10.

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