In a box, there are chocolate bars of 3 colours, blue, yellow and gold. There are 480 more yellow chocolate bars than gold chocolate bars. The number of gold chocolate bars is ¹₂ more than the blue chocolate bars. Given that the number of gold chocolate bars is 15% of the total number of chocolate bars in the box, how many more yellow chocolate bars are there than blue chocolate bars?

Blue chocolate bars	Yellow chocolate bars	Gold chocolate bars
	1 u + 480	1 u
2x5		3x5
85%		15%
10%	75%	15%

1 + ¹₂ = ²₂ + ¹₂ = ³₂

Yellow chocolate bars : Purple chocolate bars = 2 : 3

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

3 x 5 = 15%

Total number of blue chocolate bars and yellow chocolate bars in percent
= 100% - 15%
= 85%

Number of yellow chocolate bars in percent
= 85% - 10%
= 75%

Number of more yellow chocolate bars than gold chocolate bars in percent
= 75% - 10%
= 60%

60% = 480

1% = 480 ÷ 60 = 8

Number of more yellow chocolate bars than blue chocolate bars
= 75% - 10%
= 65%
= 65 x 8
= 520

Answer(s): 520