Question

A bag has red and blue balls in the ratio 4:5. If the total number of balls is 81, then find the number of blue balls

Answer 1

let us assume ratio as parts

adding them

we get

9parts of 81 balls

1 part is 9 balls

5 part is 45 balls

blue is 45parts

Answer 2

There are 45 blue balls.

Given : A bag has red and blue balls in the ratio 4:5. The total number of balls is 81

To find : The number of blue balls.

Solution :

We can simply solve this mathematical problem by using the following mathematical process. (our goal is to calculate the number of blue balls)

Let, the number of red balls = 4x

and, the number of blue balls = 5x

(Obtained from the ratio 4:5)

Total number of balls = 4x + 5x = 9x

According to the data mentioned in the question,

9x = 81

x = 81/9

x = 9

Number of blue balls = 5x = 5×9 = 45

(This will be considered as the final result.)

Hence, there are 45 blue balls.