Question

there are 22 blue and black balls in a basket, and the ratio blue balls:black balls is 7:4. 4 more black balls are added. find the percentage increase in black balls.​

Answer 1

Answer:

there are 22 blue and black balls in a basket, and the ratio blue balls:black balls is 7:4. 4 more black balls are added. find the percentage increase in black balls.

Solution:

$7x + 4x = 22 \\ \\ \to \: 11x = 22 \\ \\ x = \frac{ { \cancel{22}} \: \: \: ^{2} }{ \cancel{11}} \\ \\ x = 2$

Hence,

There are 14 blue and 8 black balls.

After adding 4, we get 12 black ball.

Percentage of black balls is 46.15%

Percentage of blue balls is 53.85%

Answer 2

Thanks for your question...

Your required answer :

• black ball - 46.15%

• 46.15%blue balls - 53.85%

Given

• there are 22 blue and black balls in a basket, and the ratio blue balls:black balls is 7:4. 4 more black balls are added.

To find :

• percentage increase in black balls.

Equation formed :

• 7x + 4x = 22

Solution :

• 7x + 4x = 22
• 11x = 22
• x = 2

Given that :

• 8 black ball + 4 = 12 black ball

Brainliest Please