In a box, there are chocolate bars of 3 colours, blue, yellow and white. There are 134 less white chocolate bars than yellow chocolate bars. The number of white chocolate bars is ¹₃ more than the blue chocolate bars. Given that the number of white chocolate bars is 12% of the total number of chocolate bars in the box, how many less blue chocolate bars are there than yellow chocolate bars?

Blue chocolate bars	Yellow chocolate bars	White chocolate bars
	1 u + 134	1 u
3x3		4x3
88%		12%
9%	79%	12%

1 + ¹₃ = ³₃ + ¹₃ = ⁴₃

Yellow chocolate bars : Purple chocolate bars = 3 : 4

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

4 x 3 = 12%

Total number of blue chocolate bars and yellow chocolate bars in percent
= 100% - 12%
= 88%

Number of yellow chocolate bars in percent
= 88% - 9%
= 79%

Number of more yellow chocolate bars than white chocolate bars in percent
= 79% - 9%
= 67%

67% = 134

1% = 134 ÷ 67 = 2

Number of less blue chocolate bars than yellow chocolate bars
= 79% - 9%
= 70%
= 70 x 2
= 140

Answer(s): 140