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 of blue balls in the group. Find
the percentage increase in black balls.



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Answer 1

Answer:

9.79%

Step-by-step explanation:

There were 14 blue and 8 black balls in the basket as per the ratio.

So percentage of blue balls

= 14/22 = 7/11≈ 0.6364 ≈ 63.64%

Initial percentage of black balls

= 100℅ - 63.64% = 36.36%

4 more black balls were added. So the total number of black balls is now 12.

But the total number of balls also increases by 4 to 26.

So, new percentage of black balls

= 12/26 = 6/13 ≈ 0.4615 ≈ 46.15℅

Percentage increase of black balls

= 46.15% - 36.36% = 9.79%

Hope that helps you....

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