In a container, there are chocolate bars of 3 colours, blue, grey and white. There are 20 less white chocolate bars than grey chocolate bars. The number of white chocolate bars is ¹₄ more than the blue chocolate bars. Given that the number of white chocolate bars is 35% of the total number of chocolate bars in the container, how many less blue chocolate bars are there than grey chocolate bars?

Blue chocolate bars	Grey chocolate bars	White chocolate bars
	1 u + 20	1 u
4x7		5x7
65%		35%
28%	37%	35%

1 + ¹₄ = ⁴₄ + ¹₄ = ⁵₄

Yellow chocolate bars : Purple chocolate bars = 4 : 5

The number of white chocolate bars is repeated.  Make the number of white chocolate bars the same.

5 x 7 = 35%

Total number of blue chocolate bars and grey chocolate bars in percent
= 100% - 35%
= 65%

Number of grey chocolate bars in percent
= 65% - 28%
= 37%

Number of more grey chocolate bars than white chocolate bars in percent
= 37% - 28%
= 2%

2% = 20

1% = 20 ÷ 2 = 10

Number of less blue chocolate bars than grey chocolate bars
= 37% - 28%
= 9%
= 9 x 10
= 90

Answer(s): 90